the fetal growth
TRANSCRIPT
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Fetal Growth: Conception to Birth
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Conception
If a sperm cell meets and penetrates an egg, it will fertilize it. This is known asconception.
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Fetal Development at 4 Weeks
At this point of development the structures that eventually form the face and neck are becoming evident. The heartand blood vessels continue to develop. And the lungs, stomach, and liver start to develop.
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Fetal Development at 8 Weeks
The baby is now a little over half an inch in size. Eyelids and ears are forming, and the tip of the nose is visible. Thearms and legs are well formed. The fingers and toes grow longer and more distinct.
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Fetal Development at 12 Weeks
The fetus measures about 2 inches and starts to make its own movements. You may start to feel the top of your uterus above the pubicbone. Your doctor may hear the baby's heartbeat with special instruments. The sex organs of the baby should start to become clear.
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Fetal Development at 16 Weeks
The fetus now measures about 4.3 to 4.6 inches and weighs about 3.5 ounces. The top of your uterus should be felt about 3 inchesbelow your belly button. The baby's eyes can blink and the heart and blood vessels are fully formed. The baby's fingers and toes shouldhave fingerprints.
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Fetal Development at 20 Weeks
The baby weighs about 10 ounces and is a little over 6 inches long. Your uterus should be at the level of your belly button. The baby cansuck a thumb, yawn, stretch, and make faces. Soon -- if you haven't already -- you'll feel your baby move, which is called "quickening."
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Time for an Ultrasound
An ultrasound is generally performed for all pregnant women at 20 weeks of gestation.
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Fetal Development at 24 Weeks
The fetus weighs about 1.4 pounds now. It responds to sounds by moving or increasingits pulse.
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Fetal Development at 28 Weeks
The fetus weighs about 2 pounds 6 ounces. It changes position frequently at this point inpregnancy. There's a good chance of survival if your baby is born prematurely now.
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Fetal Development at 32 Weeks
Often moving, the fetus weighs almost 4 pounds. The baby's skin has fewer wrinkles as alayer of fat starts to form under the skin. It will gain up to half its birth weight between nowand delivery.
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Fetal Development at 36 Weeks
Babies differ in size, depending on many factors (such as gender, the number of babies being carried, and size of theparents), so your baby's overall rate of growth is as important as the actual size.
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Birth!
A mother's due date marks the end of her 40th week. A pregnancy begins with implantation and the delivery date can be calculatedusing the first day of the last period. Based on this, pregnancy can last between 38 and 42 weeks with a full-term delivery occurringaround 40 weeks. Some post-term pregnancies -- those lasting more than 42 weeks -- are not truly post-term. A common "cause" is anincorrect due date.
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Reference:
WebMD.comReviewed by Louise Chang, MD
on August 11, 2011