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Fetal development: The 3rd trimester

Week 30: Baby's hair grows

Thirty weeks into your pregnancy, or 28 weeks after conception, your baby's eyes can open wide. Your baby might have a good head of hair by this week. Red blood cells are forming in your baby's bone marrow.

By now your baby might be more than 10 1/2 inches (270 millimeters) long from crown to rump and weigh nearly 3 pounds (1,300 grams).