Baby Development In The WombPosted on 2013-06-25 22:00:24
Fertilization/conception happens when a sperm meets and penetrates an egg. Within about three days after conception, the fertilized egg is dividing very fast into many cells. It passes through the fallopian tube into the uterus, where it attaches to the uterine wall. The placenta, which will nourish the baby, also starts to form. The gender of the baby is already set at this stage. At 4 weeks the baby is developing the structures that will eventually form his face and neck. The heart and blood vessels continue to develop as the lungs, stomach, and liver start to develop. A home pregnancy test at this stage would show positive. At 8 weeks eyelids and ears are forming, and you can see the tip of the nose. The arms and legs are well formed. The fingers and toes grow longer and more distinct. At 12 weeks the baby starts to make its own movements. You may start to feel the top of your uterus above your pubic bone. Your doctor may hear the baby's heartbeat with special instruments. The sex organs of the baby start to become clear at this stage. At 16 weeks you should be able to feel the top of your uterus. The baby's eyes can blink and the heart and blood vessels are fully formed. The baby's fingers and toes have fingerprints. At 20 weeks your uterus should be at the level of your belly button. The baby can suck a thumb, yawn, stretch, and make faces. Soon, if you haven't already, you’ll feel your baby move. An ultrasound is usually done for all pregnant women at 20 weeks. During this ultrasound, the doctor will make sure that the placenta is healthy and attached normally and that your baby is growing properly. You can see the baby's heartbeat and movement of its body, arms, and legs on the ultrasound. You can usually find out whether it's a boy or a girl at 20 weeks. At 28 weeks the baby changes position often at this point in pregnancy. If you had to deliver prematurely now, there is a good chance the baby would survive. Now is the time to register for birthing classes. Birthing classes prepare you for many aspects of childbirth, including labor and delivery and taking care of your newborn. At 32 weeks the baby is moving around often. The baby's skin has fewer wrinkles as a layer of fat starts to form under the skin. Between now and delivery, your baby will gain up to half his birth weight. You may notice a yellowish fluid leaking from your breasts. That is colostrum, and it happens to get your breasts ready for making milk. Most women go to the doctor every two weeks at this stage of pregnancy. At 36 weeks babies differ in size, depending on many factors, such as gender, the number of babies being carried, and size of the parents. So your baby's overall rate of growth is as important as the actual size. The brain has been developing rapidly. Lungs are nearly fully developed. The head is usually positioned down into the pelvis by now. A mother's due date marks the end of her 40th week. The delivery date is calculated using the first day of her last period. Based on this, pregnancy can last between 38 and 42 weeks with a full-term delivery happening around 40 weeks. For safety reasons, most babies are delivered by 42 weeks. Sometimes the doctor may need to induce labor.
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