What causes birth defects?
We know the cause for some birth defects, but for most, we don’t. That’s because we think most birth defects are caused by a complex mix of factors. There are some factors that can increase the chance of having a baby with a birth defect. These are called risk factors and include:
- Smoking, drinking alcohol, or taking certain “street” drugs during pregnancy.
- Having certain medical conditions, such as obesity or uncontrolled diabetes.
- Taking certain medications, such as some acne drugs.
- Having someone in your family with a birth defect.
- Being an older mother, typically over 34.
- And exposure to some chemicals and viruses during pregnancy.
- Page last reviewed: December 29, 2015
- Page last updated: December 29, 2015
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