12 Weeks Pregnant

Your Baby's Development at Week 12 of Pregnancy

By the time you are 12 weeks pregnant, your baby is about 2.5 inches long and weighs approximately 0.3 to 0.5 ounces. While this may not seem like a lot, your baby has doubled in size in the last 3 weeks (imagine if you did that!). Also, during the next few weeks, the finishing touches on the internal organs will occur, and your baby's face will start to look more human.
Fetal developments that usually occur during week 12 include the following:
  • A skeleton of cartilage is forming
  • The gallbladder secretes bile from the fetus
  • The lungs are completely formed
  • The thyroid gland and pancreas are now complete
  • The liver is functioning to make blood cells
  • The liver accounts for about 10 percent of the entire weight of the fetus
  • Your baby's first urine is made and eliminated into the amniotic sac
  • Your baby's intestines can now fit into his or her abdomen.
Also, by week 12 of pregnancy, the fetal muscles are sufficiency developed to allow spontaneous twitches. For example, if the forehead is touched, the fetus will turn its head away.
Pregnancy and Pain

Week by Week Pregnancy

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