My Baby's Growth

Fetal development - month 9

Third trimester

At the end of 9 months:

  • Baby is 19 to 20 inches long.
  • Weight is about 7 to 7-1/2 pounds.
  • The lungs are mature.
  • Baby is now fully developed and can survive outside the mother’s body.
  • Skin is pink and smooth.
  • The baby settles down lower in the abdomen to prepare for birth and may seem less active.