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Your Baby’s Prenatal Development in the Second Trimester

Last Updated: September 03, 2009

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Prenatal Tips for the Second Trimester


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Prenatal Month 4

  • Baby is 4 to 5 inches long
  • Weighs 3 to 5 ounces, which is about the same as a small banana
  • Baby is covered in soft down-like hair
  • Heartbeat is strong
  • Stomach and rest of digestive system are growing
  • Eyes, ears, nose, and mouth look normal
  • Eyebrows and hair are growing
  • Future mom’s average weight gain is 3-4 pounds

Prenatal Month 5

  • Baby is about 8 inches long
  • Weighs 1 pound
  • Baby is strong enough for Mom to feel a kick
  • Heart, lungs, and digestive system are growing
  • Bones are forming and fingernails are growing
  • Future mom’s average weight gain is 3-4 pounds

Prenatal Month 6

  • Baby grows a lot this month and can be anywhere from 9-15 inches long
  • Weighs 1½ to 2 pounds
  • Can open his eyes and suck his thumb
  • Baby can have hiccups
  • Brain is growing fast
  • Eyelashes and sex organs have formed
  • Future mom’s average weight gain is 3-4 pounds


Learn more about Your Prenatal Baby: Second Trimester from Just In Time Parenting. You can also go to our Resource Links for additional information on child care and development.


Note to Parents: When reading this newsletter, remember: Every baby is different. Children may do things earlier or later than described here. This newsletter gives equal space and time to both sexes. If he or she is used, we are talking about all babies.
References: These materials were adapted by authors from Extension Just in Time Parenting Newsletters in California, Delaware, Georgia, Iowa, Kentucky, Maine, Tennessee, Nevada, New Hampshire, New Mexico, and Wisconsin.

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