
Baby's Environment
Throughout her development in your womb, your baby lives in a sac of amniotic fluid, a clear liquid that protects the baby, gives her fluids, and allows her to move around. Your infant additionally inhales this liquid into his lungs and swallows it.
First Trimester
During the first trimester, from conception to your 13th week of pregnancy, your baby grows to be about three inches long and develops the beginnings of every major organ in her body.
Second Trimester
In the second trimester, which goes through week 26 of your pregnancy, your baby increases to be about 14 inches long and weighs just over two pounds. His hair, skin and organs develop further, and you can feel his movements now that his size has increased.
Third Trimester
During the third trimester, lasting until birth, your baby packs on the pounds, growing until she is about 20 inches long and weighs six to 10 pounds. His organs finish maturing, with his lungs developing until the day of his birth.
Mom's Role
You provide your developing baby with the best chances of maintaining healthy development in the womb by exercising according to your doctor's guidelines, eating well, taking a daily prenatal vitamin and avoiding smoking, alcohol and drugs.
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