準媽媽的40 周 胎兒成長篇 3D 效果圖一覽

Month/Week	第1周	第2周	第3周	第4周
1	1	2	3	4
2	5	6	7	8
3	9	第10周：5g / 3.1-4.2cm 10	第11周：8g / 4.4-6cm 11 boy	第12周：8-14g / 6.1cm 12
			11 girl
4	第13周：13-20g / 6.5-7.8cm 13	第14周：25g / 8-9.3cm 14	第15周：50g / 9.3-10.3cm 15	第16周：80g / 10.8-11.6cm 16
5	第17周：100g / 11-12cm 17	第18周：150g / 12.5-14cm 18	第19周：200g / 13-15cm 19	第20周：260g / 14-16cm 20 Boy
				第20周：260g / 14-16cm 20 Girl
6	21	22	23	24
7	25	26	27	28
8	29	30	31	32
9	33	34	35	36
10	37	38	39	40

Table Cell	Table Cell	Table Cell	Table Cell	Table Cell	Table Cell
First Trimester>	1	Your Baby in Weeks 1 and 2 of Pregnancy No, there’s no baby or even an embryo in sight (at least not yet). But in week two of pregnancy, your body is working hard to gear up for the event that paves the way for the baby: the big O — ovulation. The lining of your uterus is thickening, preparing for the arrival of a fertilized egg, while your ovarian follicles are maturing. One of those follicles will release the egg that will travel down the fallopian tube in search of Mr. Right — the lucky sperm that will turn that eager egg into a baby-in-the-making and make your body’s prep work worth all the effort.		Your Baby in Week 3 of Pregnancy The moment you’ve been waiting for has finally arrived: You’ve conceived and your soon-to-be-baby has started on its miraculous transformation from single cell to baby boy or girl. This week, the fertilized egg — or zygote — divides several times over to become a tiny ball of microscopic cells smaller than the period at the end of this sentence. As it divides, the blastocyst, as it's now called (don't worry, you'll come up with a cuter name soon!), makes its way from your fallopian tube to your uterus, where it will implant itself in the uterine wall and grow for the next nine months.	Your Baby in Week 4 of Pregnancy No bigger than a poppy seed, the ball of cells that will develop into your baby has completed its journey from your fallopian tube to your uterus. Once settled in its new home, it will undergo the great divide — splitting into two groups. Half will become your baby (or embryo), while the other half forms the placenta, your baby's lifeline until delivery. The multilayered embryo then begins to grow into specialized parts of your baby's body. The inner layer, known as the endoderm, will develop into your baby's digestive system, liver, and lungs. The middle layer, called the mesoderm, will soon be your baby's heart, sex organs, bones, kidneys, and muscles. The outer layer, or ectoderm, will eventually form your baby's nervous system, hair, skin, and eyes.
	2	Your Baby in Week 5 of Pregnancy Your baby now resembles a teeny tadpole (complete with a tiny tail) and is about the size of an orange seed. The circulatory (or blood) system, along with the heart, is the first part of that tiny body to be functional; and as your baby's heart starts to form, you may even be able to see it beating on an early ultrasound. Another part of your little tadpole that is under construction: the neural tube, which will eventually become your baby's brain and spinal cord. Learn more about your baby this week and fetal heart development.	Your Baby in Week 6 of Pregnancy You might be coping with full-blown pregnancy symptoms (sorry), but there's plenty of good news too. Your baby's jaw, cheeks, chin, eyes, ears, and nose are beginning to form what will eventually become one adorable face. In addition, her kidneys, liver, and lungs are developing, and her heart is now beating 80 times a minute (and getting faster every day). All this and she's still no bigger than the length of a nail head (about a quarter of an inch) from crown to rump!	Your Baby in Week 7 of Pregnancy Your baby is now about the size of a blueberry (and about 10,000 times bigger than he was at conception). Most of that growth is concentrated in the head as new brain cells are generated at the rate of 100 per minute. Your baby's mouth and tongue are forming as arm and leg buds sprout, and those little kidneys are getting ready to do their job (pee production and excretion).	Your Baby in Week 8 of Pregnancy Your baby is growing at an amazing rate — about a millimeter every day — and now is the size of a large raspberry. Your little berry is looking a lot less reptilian (even though she has webbed fingers and toes, her tail is just about gone) and a lot more baby-like these days, as her lips, nose, eyelids, legs, and back continue to take shape. Her heart is beating at the incredible rate of 150 times per minute — about twice as fast as yours! And even though you can't yet feel it, she's now making spontaneous movements as she twitches her tiny trunk and limb buds.
	3	Your Baby in Week 9 of Pregnancy Your baby, now the size of a green olive, has grown about an inch since last week. Tiny muscles are beginning to form, so while he might not be ready to pump iron, he's gearing up to move his arms and legs. It's still too soon to feel anything in your belly, but you might be able to hear something at your next checkup. Try listening for your baby's heartbeat via a Doppler device — that welcome sound should be audible anytime now.	Your Baby in Week 10 of Pregnancy Your baby (now the size of a prune) has small indentations on his legs (soon to be knees and ankles!), and his tiny arms even have elbows that bend (how is that for magical?). Inside that little mouth, tiny buds of baby teeth are forming under the gums. His stomach and kidneys are kicking into gear, producing digestive juices and urine, and if it's a boy, his testes are making testosterone (how manly!).	Your Baby in Week 11 of Pregnancy Your baby (now about two inches long) has been pretty busy this week, growing hair follicles, fingernails, and ovaries (if she's a girl). She has distinct human characteristics by now, with hands and feet in front of her body, with ears nearly in their final shape, open nasal passages on the tip of her tiny nose, a tongue and palate in the mouth, and visible nipples. What else makes her look human? Those hands and feet have individual fingers and toes (meaning good-bye to those froglike webbed hands and feet). Hooray!	Your Baby in Week 12 of Pregnancy By now, your baby weighs a full half-ounce and is about the size of a large plum. Most of his systems are in place, though there's still plenty of maturing to do. For one thing, his fetal digestive system is beginning to practice contraction movements necessary for eating, and his bone marrow is busy making white blood cells — weapons against germs once he's out of your safe haven. The pituitary gland (at the base of the brain) has started producing the hormones that'll enable him (or her) to make babies of his (or her) own in a couple of decades or so.
Second Trimester>	4	Your Baby in Week 13 of Pregnancy What's up with your baby? Well, besides being as large as a peach now, that big old noggin of hers is now about half the size of her crown-to-rump length (that’s one reason why your little peach looks more like an alien from outer space at this point). By the time you give birth, her body will catch up, measuring three-quarters of her total size. What else is going on in there? Tiny bones are beginning to form in her arms and legs, the intestines are beginning to move from the umbilical cord to the abdomen, and the vocal cords are well under construction (the first step toward saying, "I love you, Mommy!"). And because she can move her arms and legs in a jerky fashion, she may be able to get her thumb into her mouth (a habit that may come in handy for self-soothing when she’s a newborn).	Your Baby in Week 14 of Pregnancy Now the size of your clenched fist, your baby is more fluid-like in his movements, so he’s no longer doing the jerk every time he repositions his arms and legs. Other developments this week include a roof of his own (inside his mouth, that is) as well as intestinal activity: His intestines are producing meconium (which is the waste that will make up his first bowel movement after birth). He is also sporting a downy coating of hair (lanugo) that keeps him nice and warm. Not to worry — you won't give birth to a monkey; baby fat will accumulate over the next few months and take over the function of keeping your baby warm and toasty —allowing most of that hair to shed.	Your Baby in Week 15 of Pregnancy One way to deal with the havoc of pregnancy hormones: Focus on how much is happening with your baby. She's about the size of an orange this week, her ears have migrated to the sides of her head, and her eyes are moving to the front of her face. Plus, your little smarty-pants can now wiggle her fingers and toes and make breathing movements in preparation for life outside the womb.	Your Baby in Week 16 of Pregnancy Your baby now weighs in at a whopping three to five ounces, and he's four to five inches in length. The bones that are now in place in his ears means he can probably hear your voice as you talk to your partner and pals and sing in the car. While he’s getting used to your voice, the tiny muscles in his body, especially the ones in his back, are gaining strength, so he can straighten out a little more. And thanks to his developing facial muscles, your baby is capable of making a few expressive frowns and squints, even at this early stage. (Don’t worry, those frowns have nothing to do with the sound of your voice!) And his eyes are finally working, making small side-to-side movements and perceiving light (although the eyelids are still sealed). Peekaboo!
	5	Your Baby in Week 17 of Pregnancy My how your baby has grown! She's about the size of your palm, weighs about five ounces, and is developing some body fat (join the club, baby!). Her heart is now regulated by her brain (no more random beats) to beat 140 to 150 times per minute — about twice as fast as yours! What else is up? She’s practicing the survival skills she’ll need at birth — like sucking and swallowing.	Your Baby in Week of 18 of Pregnancy Your pregnancy back pain may have you tied up in knots (see below), but your baby's getting ready to bust a move. At five and a half inches long and five ounces in weight, he now may be large enough for you to feel him twisting, rolling, kicking, and punching his way around the womb. Plus, he's developing yawning and hiccupping skills (you may feel those soon, too!) and his own unique set of toe and fingerprints. Table Cell	Your Baby in Week 19 of Pregnancy Have you ever seen a mango dipped in cheese? Well, that's what your baby looks like this week due to a little growth spurt (she's about a half pound in weight and six inches long) and a substance called vernix caseosa. This greasy white stuff covers your baby's skin, protecting it from the surrounding amniotic fluid. (Without it, she'd look totally wrinkled as she entered the world.) The vernix sheds as delivery approaches, though some babies still sport a bit of the coating at birth.	Your Baby in Week 20 of Pregnancy Curious about whether that melon-sized belly contains a boy or a girl? Now's your chance to take a peek! Your second trimester ultrasound, scheduled for anytime between 18 and 22 weeks, gives your practitioner a chance to see how things are going in there. And, wow, are they going! If you're having a girl, her uterus is now fully formed and her ovaries are holding about seven million primitive eggs. If you're having a boy, his testicles have begun their descent from the abdomen to their ultimate destination — the scrotum. And while your baby is definitely getting bigger (weighing in at about ten ounces and measuring six and a half inches), there's still plenty of growing room in there, which allows him to twist and turn (and allows you to feel his acrobatics!).
	6	Your Baby in Week 21 of Pregnancy How big is your baby? About the size of a large banana — and speaking of bananas, if you eat one this week, there's a good chance your baby will get a taste, too. That's because he swallows a bit of amniotic fluid each day (for nutrition, hydration, and to practice digesting), so he eats whatever's on your menu — and gets to put those developing taste buds to good use. So go ahead and nosh on those nachos (or crunch those crudités): Your baby may develop a taste for them when he’s older.	Your Baby in Week 22 of Pregnancy This week, your baby weighs in at a whopping pound and measures nearly eight inches, about the size of a small doll. But your little doll (who now has eyebrows, eyelashes, and maybe even some hair on that little head) is a living one who can now perceive light and dark. She can also hear your voice, your heartbeat, your gurgling stomach, and the whoosh-whoosh of blood circulating through your body. And as her brain and nerve endings develop, she may reach for her face (or whatever she can reach) just to experiment with her newfound sense of touch.	Your Baby in Week 23 of Pregnancy Your little doll-sized babe is about to chub up a bit. His saggy skin will start to fit his frame as fat deposits fill things out. Beginning this week, he'll start to pack on the pounds (which means you will too!) and by month's end he'll be double the weight he is now (though you won't be — whew!). Right now, your baby's organs and bones are visible through his skin, which has a red hue due to developing veins and arteries beneath. But once those fat deposits settle in, he'll become less transparent.	Your Baby in Week 24 of Pregnancy Your baby is about eight and a half inches long and weighs one and a half pounds, gaining steadily at a rate of six ounces per week. Much of that weight comes from accumulating baby fat, as well as from growing organs, bones, and muscle. Those little ears of hers are getting sharper and can hear very loud sounds, from a yapping dog to a jackhammer. Also by now, that fabulous face is almost fully formed, complete with eyelashes, eyebrows, and hair. Is your baby a brunette, a blonde, or a redhead? Actually, right now her locks are white since there's no pigment yet.
	7	Your Baby in Week 25 of Pregnancy Your baby is growing by leaps and bounds, reaching nine inches in length and passing the pound and a half mark. Under his skin, capillaries are forming and filling with blood and by week's end, air sacs (also lined with capillaries) will develop in his lungs, getting them ready for that first breath. Mind you, those lungs aren't ready for prime time just yet — but they are developing surfactant, a substance that will help them expand after birth. And speaking of breathing, your baby's tiny nostrils, which have been plugged up until now, are starting to open, and his vocal chords are getting ready to roar.	Your Baby in Week 26 of Pregnancy What's up with your baby? She now weighs a full two pounds and measures nine-plus inches. And this week, her eyes, which until now were developing under fused eyelids, start to open. Of course, there's not much to see in there, but if your baby spots a bright light (or hears a loud noise) near your belly, you may notice an increase in fetal activity. (“Hey, I'm in here, Mommy! Where’s the party!”) What accounts for that response? Her brain is more developed and sophisticated.	Your Baby in Week 27 of Pregnancy For a baby, it's time to trade in the old crown-to-rump measurement for a new head-to-toe standard. So what are your baby’s stats this week (which, coincidentally, is the end of the second trimester)? Fifteen inches — more than a foot long — and triple (or even quadruple) what it was in week 12. His weight is creeping up the charts as well, coming in at just over two pounds. More big news: Your baby may recognize your voice by now, so feel free to serenade your belly (start learning those lullabies!).	Your Baby in Week 28 of Pregnancy Your baby is settling into the proper position for birth, with his head facing downward (toward your body's nearest exit!). Your little work in progress is now about 2.5 pounds and almost 16 inches long. He's busy adding new skills such as blinking to an already impressive repertoire of tricks like coughing, sucking, hiccuping, and taking practice breaths. Your baby's sleep now includes the REM (rapid eye movement) phase — and that means he could be dreaming already (what do you suppose he's dreaming about?).
Third Trimester	8	Your Baby in Week 29 of Pregnancy How big is your baby this week? She weighs nearly three pounds now and measures about 17 inches. Though she's getting pretty close to her birth length, she still has to chub out a bit. In fact, over the next 11 weeks, she'll more than double — or even come close to tripling — her weight. And as she grows and the room in your womb gets tighter, you'll be less likely to feel those big kicks and more likely to get poked by an elbow or jabbed by a knee.	Your Baby in Week 30 of Pregnancy Your belly’s increasing size is a definite clue that your baby is getting bigger every day, weighing in at over three pounds now (he’ll be packing on the weight at a rate of half a pound per week for the next seven weeks). Also growing daily is his brain, which is actually starting to look like the real thing with those characteristic grooves and wrinkles. And now that your little genius can regulate his own body temperature and turn up the heat, he'll start shedding lanugo, the downy body hair that's been keeping him warm up until now.	Your Baby in Week 31 of Pregnancy Weighing in at three-plus pounds and measuring 18 inches long, your baby is quickly approaching his birth length — though he's got to pack on another three to five pounds before D-day. Also developing at an impressive clip: your baby's brain connections (he's got to make trillions of them!). He's now processing information, tracking light, and perceiving signals from all five senses. He's also putting in longer stretches of sleep, which is why you're probably noticing more defined patterns of wakefulness (and movement) and rest (when he’s pretty still).	Your Baby in Week 32 of Pregnancy What's up with your baby? She's starting to get ready for her big debut, tipping the scales at almost four pounds and topping out at just about 19 inches. In these past few weeks, it's all about practice, practice, practice as she hones the skills she'll need to thrive outside the womb — from swallowing and breathing to kicking and sucking. And speaking of sucking, your little one has been able to suck her thumb for a while now. Something else to note: As more and more fat accumulates under your baby's skin, she's becoming less transparent and more opaque.
	9	Your Baby in Week 33 of Pregnancy Your baby is still gaining weight (about half a pound a week), and she could grow up to another full inch this week. With that much baby inside your uterus, your amniotic-fluid level has maxed out, which explains why some of her pokes and kicks feel pretty sharp these days. (There's less fluid to cushion the blows.) Antibodies are being passed from you to your little one as she continues to develop her own fetal immune system, which will come in handy once she's outside the womb and fending off all sorts of germs.	Your Baby in Week 34 of Pregnancy What's new this week? Your baby is clocking in at five pounds and could be as tall as 20 inches by now, and the vernix (the white coating protecting your baby’s skin) is getting thicker. This week, a boy's testicles start making their way down from his abdomen to their final destination: his scrotum (look out below!). While about three to four percent of boys are born with undescended testicles, it's nothing to worry about — they usually head downtown before junior turns a year old. In other baby-related developments, those tiny fingernails have probably reached the tips of his fingers by now — and getting ready for that first postpartum manicure.	Your Baby in Week 35 of Pregnancy Your baby is standing tall (so to speak) this week at about 20 inches and continues her steady weight gain (she’s about 5.5 pounds). While she won't get much longer, she will continue to pack on the pounds — including large amounts of baby fat — right up 'til delivery day. Something else that's moving at a mind-boggling pace these day: fetal brain development! There’s a lot going on inside that tiny head, which is, by the way, still soft to allow an easier exit through the birth canal.	Your Baby in Week 36 of Pregnancy Forget your aching back (and everything else!) by trying to focus on your baby, who is now about six pounds and 20 inches long, with soft bones and cartilage to allow a safer journey through the exit door. Most of her systems (from circulatory to musculoskeletal) are ready for prime time, though her digestion system — which has done only practice runs so far — will kick into gear as she takes her first suckle at the breast or bottle.
	10	Your Baby in Week 37 of Pregnancy Congratulations! You've got what is officially considered a full-term baby, even with three weeks to go. That doesn't mean he's finished growing — in fact, he's still packing on about a half pound a week (at this age, the average fetus weighs about 6.5 pounds). That makes it a little crowded in your uterus, so he’s probably not kicking as much, though he’s probably stretching, rolling a bit, and wiggling (all of which you’ll be able to feel!). Right now, your little superstar is busy rehearsing for his big debut, inhaling and exhaling amniotic fluid (to get the lungs ready for that first breath), sucking his thumb (to prepare for that first suckle of milk), blinking, and turning from side to side.	Your Baby in Week 38 of Pregnancy Hey, your little one isn't so little anymore, weighing close to seven pounds and measuring 20 inches long. Fetal development is nearly complete as your baby tends to a few last-minute details like shedding the skin-protecting vernix and lanugo. He's also producing more surfactant, a substance that prevents the air sacs in his lungs from sticking to one another once he starts to breathe. Most of the changes this week are small but important: He’s continuing to add fat (so he can take advantage of all those photo ops by sporting a round, cute baby look!) and fine-tuning his brain and nervous system (so he can deal with all the stimulation that awaits him once he makes his entrance into the world).	Your Baby in Week 39 of Pregnancy Coming down to the wire, your baby weighs around seven to eight pounds and measures 19 to 21 inches. Those measurements won't change much from now on, but her brain is still growing at an astonishing rate, a pace that will continue for the first three years of life. Her pink skin has now turned whitish (even babies who'll eventually have darker skin appear whitish now — they haven't yet developed pigment). Her head may have dropped into your pelvis by now, which makes your breathing easier but walking harder.	Your Baby in Week 40 of Pregnancy Congratulations! This week marks the official end of your pregnancy. Your baby probably weighs anywhere from six to nine pounds and measures between 19 and 22 inches (though tons of perfectly healthy babies are smaller or bigger). The bones in his skull haven’t fused yet — Mother Nature’s way of making it easier to get through the birth canal during labor and delivery. He now has enough fat under the skin to maintain his body temperature outside the womb (with a little help from those cute outfits and swaddling blankets that you’ve been stocking up on!). You (or actually the placenta) are still providing the antibodies he’ll need to fight off infections for the first six months of his life. And if you plan on breastfeeding, your milk will be giving him more antibodies that’ll boost his immune system.
	Table Cell	11	Your Baby in Week 41 of Pregnancy It seems like your baby has opted for a late checkout, quite a popular option judging by the numbers. Fewer than five percent of babies are born on their actual due dates — and around 50 percent decide to overstay their welcome in Hotel Uterus, thriving well into the tenth month. Remember, too, that most of the time an overdue baby isn't overdue at all — it's just that the due date was off. But your baby isn’t just lounging around in there, waiting for his big day. His endocrine system is getting ready to produce stress hormones (you aren’t the only one who’s s tressed!), which he’ll need to survive outside the womb.	Your Baby in Week 42 of Pregnancy Although it's perfectly normal for a baby to arrive past the due date, you and your baby will get some extra attention this week. To be sure all is well, your practitioner will likely monitor your overdue baby through nonstress tests (you're hooked up to a fetal monitor to measure your baby's heart rate and movement) and amniotic-fluid checks. When this latecomer finally makes her debut, chances are her skin will be dry, cracked, peeling, or wrinkled — all completely temporary. That's because the protective vernix was shed weeks ago in anticipation of a delivery date that came and went. A tardy baby will also have longer nails, possibly longer hair, and little or none of that baby fuzz (lanugo). She’ll also be more alert — “Hi, Mommy!”

第10周：5g / 3.1-4.2cm
第11周：8g / 4.4-6cm
第12周：8-14g / 6.1cm
第13周：13-20g / 6.5-7.8cm
第14周：25g / 8-9.3cm
第15周：50g / 9.3-10.3cm
第16周：80g / 10.8-11.6cm
第17周：100g / 11-12cm
第18周：150g / 12.5-14cm
第19周：200g / 13-15cm
第20周：260g / 14-16cm
第21周：300g / 18cm
第22周：350g / 19cm
第23周：455g / 20cm
第24周：540g / 21cm
第25周：700g / 22cm
第26周：910g / 23cm
第27周：1000g / 24cm (身長總長約34cm)
第28周：1100g / 25cm (身長總長約35cm)
第29周：1250g / 26cm (身長總長約37cm)
第30周：1350g / 27cm (身長總長約38cm)
第31周：1600g / 28cm (身長總長約40cm)
第32周：1800g / 29cm (身長總長約42cm)
第33周：2000g / 30cm (身長總長約43cm)
第34周：2280g / 32cm (身長總長約44cm)
第35周：2500g / 33cm (身長總長約45cm)
第36周：2750g / 34cm (身長總長約46cm)
第37周：2950g / 35cm (身長總長約47cm)
第38周：3100g / 35cm (身長總長約47cm)
第39周：3250g / 36cm (身長總長約48cm)
第40周：3400g / 37-38cm (身長總長約48-50cm) 

 懷孕週數及胎兒體重對照表

產檢時若醫生測出胎兒體重低於表中10%,就表示胎兒體重不足。
若大於表中90%,就表示胎兒體重過重囉!!!
單位:公克
週數
性別-----10%-25%-50%-75%-90%
26週 男 707--817--915--904---1201
26週 女 494--785--915--1057-1190
27週 男 875--1010-1121-1313-1486
27週 女 696--882--1042-1167-1357
28週 男 1025-1185-1327-1579-1785
28週 女 844--998--1185-1327--1600
29週 男 1161-1346-1525-1803-2072
29週 女 966--1132-1342-1522-1877
30週 男 1290-1500-1712-1997-2328
30週 女 1083-1281-1513-1740-2157
31週 男 1417-1652-1888-2170-2543
31週 女 1212-1452-1695-1968-2416
32週 男 1551-1808-2055-2335-2719
32週 女 1336-1634-1887-2199-2640
33週 男 1698-1971-2219-2500-2863
33週 女 1543-1828-2086-2424-2826
34週 男 1867-2148-2389-2674-2991
34週 女 1753-2032-2291-2638-2979
35週 男 2007-2343-2576-2868-3137
35週 女 1990-2243-2500-2838-3115
36週 男 2308-2561-2795-3088-3328
36週 女 2244-2457-2709-3022-3298
37週 男 2600-2806-3064-3341-3612
37週 女 2501-2672-2892-3193-3443
38週 男 2756-2934-3191-3445-3683
38週 女 2607-2827-3048-3286-3543
39週 男 2819-3049-3313-3584-3838
39週 女 2752-2937-3183-3443-3702
40週 男 2932-3157-3420-3699-3915
40週 女 2801-3040-3294-3562-3811

~超音波專用術語~

BPD：是指胎兒頭骨橫徑！
AC：是指胎兒腹圍的長度！
CRL：是指胎兒頭頂到臀部的距離！
FL：是指胎兒大腿骨的長度！
HC：是指胎兒的頭圍！
EFBW：是指預估寶寶的總體重！
AFI：是指羊水指數！
FHB：胎心音！
FTA：是指寶寶在超音波下的週數！
DGA：是指最後一次月經所估出來的胎兒週數！
TTD：是指胎兒肚子的橫徑！
APTD：是指胎兒肚子的前後徑！
FSD：是指子宮底到恥骨聯合上緣的長度，一般來說長度的公分數就等於胎兒的週數。

測量項目：

4-7週：妊娠囊(GS)
6-13週：頭臀長度(CRL)
14-30週：雙頂骨徑(BPD)、股骨長度(FL)、腹圍(AC)
30-36週：雙頂骨徑(BPD)、腹圍(AC)、股骨長度(FL)
36-40週：頭圍(HC)、腹圍(AC)、股骨長度(FL)