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Your Baby’s Prenatal Development in the Third and Last Trimester

Last Updated: June 10, 2010

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Prenatal Tips for the Third Trimester


Ultrasound.jpg

Prenatal Month 7

  • Baby is 14-18 inches long
  • Weighs 3-4 pounds
  • Looks very red and wrinkled
  • Baby is beginning to store iron for the months after birth
  • Brain is still growing fast
  • Lungs are developing and bones are hardening
  • Hand grip is so strong that he could support his whole weight
  • Future mom’s average weight gain is 3-4 pounds

Prenatal Month 8

  • Baby is 16-20 inches long
  • Weighs 4-6 pounds
  • Baby is putting on a protective layer of fat
  • Baby is still storing iron for months after birth
  • Is beginning to develop some protection from disease
  • Baby’s brain is still growing fast
  • Future mom’s average weight gain is 3-4 pounds

Prenatal Month 9

Baby In Womb.jpg
  • Baby is 19-22 inches long
  • Weighs 6-9 pounds
  • Baby is still storing iron
  • Baby’s skin is coated with a creamy coating
  • Head bones are soft
  • Brain is still growing
  • Future mom’s average weight gain is 3-4 pounds


Learn more about Your Prenatal Baby: Third 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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