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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 40 Week 40

When your baby arrives, he will be evaluated and graded (zero to two points each) on the following factors: activity and muscle tone, pulse (heart rate), grimace response (medically known as "reflex irritability"), appearance (skin coloration) and respiration (breathing rate and effort). This sum will determine the baby's Apgar score -- an initial measure of his health. Most healthy babies have an Apgar between seven and nine (few babies get a 10).