Environmental factors such as malnutrition,infection,radiation,or drugs can prevent the normal formation of organs and body structures.Such factors are most likely to have adverse effects during the last few months of pregnancy.

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Environmental factors are most likely to have adverse effects during the first trimester when organogenesis occurs, as this is when the major organs and structures are forming.

Environmental Factors Such as Malnutrition,infection,radiation,or Drugs Can Prevent the Normal