The Baby Blog: Fetal Development

In every pregnancy, a woman starts out with a 3-5% chance of having a baby with a birth defect. This is called her background risk. This fact sheet talks about the critical periods of development and types of birth defects that can result from exposures at different stages of pregnancy. This information should not take the place of medical care and advice from your health care provider. What are critical periods of development? In pregnancy, each part of the baby’s body forms at a specific …

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