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Your Developing Baby, Week by Week

Your baby begins as a tiny cluster of cells, but during the nine-month process of pregnancy she becomes an amazing baby with facial features, a beating heart and kicking legs. Find out what's happening with baby's development week by week.
week 25 Week 25

Your baby's first bowel movement has been forming in the large intestine. The thick, dark poop is called meconium and it's typically excreted shortly after he's born. Occasionally babies pass this stool before they're born, which means it must be suctioned after birth to clear it from the lungs.