Third Trimester Fetal Development

The growth of your baby is a continuous process that often conveys a sense of awe. The following information is divided into pregnancy’s three trimesters to help you understand your baby’s rapid growth. Milestones in fetal development are also highlighted. (Sizes and weights are approximate.)

Month 7

At the end of 7 months:

• Baby is 14 to 16 inches long.
• Weight is about 2-1/2 to 3-1/2 pounds.
• Taste buds have developed.
• Fat layers are forming.
• Organs are maturing.
• Skin is still wrinkled and red.
• If born at this time, the baby will be considered premature and require special care.

Month 8

At the end of 8 months:

• Baby is 16-1/2 to 18 inches long.
• Weight is about 4 to 6 pounds.
• Overall growth is rapid this month.
• Tremendous brain growth occurs at this time.
• Most body organs are now developed, except for the lungs.
• Movements or “kicks” are strong enough to be visible from the outside.
• Kidneys are mature.
• Skin is less wrinkled.
• Fingernails now extend beyond fingertips.

Month 9

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.