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Pregnancy and Fetal Development

Picture of Second Trimester (16 Weeks)

Picture of Second Trimester (16 Weeks)
Second Trimester: The Baby at 16 Weeks
  • Muscle tissue and bone continue to form, creating a more complete skeleton.
  • Skin begins to form. You can nearly see through it.
  • Meconium (mih-KOH-nee-uhm) develops in your baby's intestinal tract. This will be your baby's first bowel movement.
  • Your baby makes sucking motions with the mouth (sucking reflex).
  • Your baby reaches a length of about 4 to 5 inches and weighs almost 3 ounces.

Related Topics
  Stages of Pregnancy Slideshow

Reviewed by William C. Shiel Jr., MD, FACP, FACR on August 21, 2009

Image Source: Nestle / Petit Format / Photo Researchers, Inc.

Text: Womenshealth.gov - Healthy Pregnancy: Stages of Pregnancy