Serious congenital abnormalities occur in 2% of live births, 30% of stillbirths and 18% of first week neonatal deaths, accounting for 25% of perinatal deaths. They may be due to (a) genetic (chromosomal or single-gene) defects, (b) environmental factors (alcohol, drugs, toxic chemicals), or (c) a combination (multisystem abnormalities).
KeywordsInfluenza Warfarin Cataract Hydrocephalus Hypothyroidism
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