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Moms Expertise

Your pregnancy 4 weeks: how your baby is growing

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07/21/14

Three different layers of cells develop and each type will create different parts of your baby's body. The outer layer, or ectoderm, forms the skin, hair, nails, nipples, and tooth enamel together with the lenses of the eyes, the nervous system, and the brain. The middle layer, or mesoderm, will become a skeleton and muscles, the heart and blood vessels, together with the reproductive system. The innermost layer, the endoderm, gives rise to the respiratory and digestive systems including the liver, pancreas, stomach, and bowel together with the urinary tract and bladder.

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Your pregnancy 4 weeks: how your baby is growing
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