Which trimester is an especially critical period when poor nutrition or drug use can result in birth defects?

Name: Which trimester is an especially critical period when poor nutrition or drug use can result in birth defects?
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Question

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The first trimester is a critical period in pregnancy because it is when the major organs and structures of the fetus begin to develop. Poor nutrition or drug use during this time can lead to birth defects or other serious problems.

Which Trimester Is an Especially Critical Period When Poor Nutrition