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Fetal Development Basics & Pregnancy. At 4 weeks, the cells of the fetus are specializing into a nervous system, hair, organs, and skin. At 12 weeks, the fetus is around 2 _ inches in size and makes movement on its own. At 20 weeks, the nervous systems functions, sex can be determined, and you will feel your baby move.At 28 weeks, the fetus weighs over 2 pounds and if born prematurely, would most likely be able to survive. At 32 weeks, the baby weighs 4 pounds and fat layers begin to develop under its skin.our doctor will use your gestational age to track your baby's growth and development and possibly to schedule tests throughout your pregnancy. Normal gestation can range from about 37 to 41 weeks, so estimated due dates are accurate for only about one out of every 20 pregnancies.
As an ob-gyn, I thought I would feel my own baby moving long before 20 weeks, but I didn't feel anything until 22 weeks, she adds. If you've been pregnant before, or you live in a quiet or rural place, you may feel kicks as early as 17 to 18 weeks, Dr. Artal says. Additionally, if your placenta attaches in the front of your uterus instead of in the back, it may make it harder to feel movements, particularly early on.