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Toxins usually cause more severe medical problems if exposure is during the first eight weeks of pregnancy rather than during the later weeks Why?
Wiki User
∙ 9y ago
The first 8 weeks are the prime time for forming organs and maturing nervous systems, including the brain. If you interrupt development at that time, the organs will never be normal. If exposures happen later, the fetus may suffer ill effects, but the organs will be at least be mostly fully formed by then.
Wiki User
∙ 9y ago
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