The potential adverse effect of teratogens on the fetus is evident from research. Nevertheless, it is also crucial to understand when these effects are the most harmful. As explained by Moussa et al., neural development occurs by six weeks of gestation, meaning that the period from 1-6 weeks is particularly risky for the fetus with respect to teratogenic effects. Still, the impact of teratogens during later weeks can affect the development of particular organs, causing birth defects beyond the neurological. It is crucial for a patient to monitor her health continuously throughout pregnancy, even if no neural tube defects are identified during the analysis.
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