This week your baby weighs about ½ an ounce and is about 3 inches long.  If you could see your baby, you’d see quite an active little one – twisting, turning and kicking.  The baby is completely engulfed in amniotic fluid at this point.  This fluid is about 1.5 ounces in volume.

The growth of the baby’s head slows down considerably by the end of this week.  The brain has the same structure it will have at birth, although it will be quite larger.  Hair is beginning to grow on the baby’s head now and teeth are forming as well as taste buds and vocal cords.

The intestines are beginning to contract as if they were digesting food and are moving from the umbilical cord into the body cavity.  A large portion of the amniotic fluid will be the baby’s urine from this point on as the kidneys begin to excrete urine. 

If this is your first pregnancy, you probably aren’t showing yet, although your clothing and bra is probably feeling very snug.  If this is not your first pregnancy your abdominal muscles are not as strong and you may be starting to show.  You might want to invest in some looser clothing, although you may not be quite ready for maternity clothes just yet.

Related Weeks

Fetal Development – Week 11 | Fetal Development – Week 13

Fetal Development Week by Week – Week 12