My Baby's Growth

Fetal development - month 4

Second trimester

At the end of 4 months:

  • Baby is 6-1/2 to 7 inches long.
  • Weight is about 6 to 7 ounces.
  • Baby is developing reflexes, such as sucking and swallowing, and may begin sucking thumb.
  • Tooth buds are developing.
  • Sweat glands are forming on palms and soles.
  • Fingers and toes are well defined.
  • Gender is identifiable.
  • Skin is bright pink, transparent and covered with soft, downy hair.
  • Although recognizably human in appearance, the baby would not be able to survive outside the mother’s body.