Teratogens produce deformities in the major body structures during the first trimester of pregnancy.

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Teratogens are substances, infections, or environmental factors that can cause abnormalities or deformities in a developing fetus. These effects are most pronounced during the first trimester, which is a critical period of fetal development when major organs and body structures are forming. Teratogens can include drugs, alcohol, tobacco, certain infections, and other toxins. It is important for pregnant women to avoid exposure to known teratogens to reduce the risk of birth defects.

Teratogens Produce Deformities in the Major Body Structures During the First