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CHD happens when your baby’s heart doesn’t develop correctly while they're in their mother’s womb. Scientists don’t fully understand why that happens, but it may be related to:

  • Abnormal chromosomes or genetics.
  • Drinking or smoking during pregnancy (or significant environmental exposures such as secondhand smoke).
  • Illnesses in the mother during pregnancy (diabetes, drug use, phenylketonuria or viral infection).

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