Question

what is responsible for the birth detects?

Answer 1

Birth defects can be minor or severe They may affect the appearance, organ function, or physical or mental development most birth defects are present within first three month of pregnancy, when the organ are still forming. Some birth defects are harmless, while others require long-term medical treatment. Severe birth defects are leading cause of infant death in the United States, accounting for 20 percent of death.
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Answer 2

Nongenetic causes

However, certain behaviors greatly increase the risk of birth defects. These include smoking, using illegal drugs, and drinking alcohol while pregnant. Other factors, such as exposure to toxic chemicals or viruses, also increase risk.

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