An external agent that alters foetal development is called a teratogen. Teratogens are substances or factors that can cause birth defects or negatively impact the development of a foetus during pregnancy. These agents can include chemicals, medications, infections, or environmental factors. Examples of teratogens include alcohol, tobacco smoke, certain medications, radiation, and infectious diseases. When a pregnant woman is exposed to a teratogen, it can interfere with the normal development of the foetus, leading to a range of potential birth defects or developmental delays. It is important for pregnant women to be aware of potential teratogens and take steps to avoid exposure to them during pregnancy. This can include avoiding smoking and alcohol consumption, being cautious with medications, and taking steps to minimize exposure to harmful chemicals or pollutants. In addition to avoiding teratogens, pregnant women should also focus on maintaining a healthy lifestyle and seeking regular prenatal care. This can help to ensure the best possible outcome for both the mother and the developing foetus. Overall, understanding teratogens and their potential impact on foetal development is crucial for ensuring a healthy pregnancy and birth. By being informed and taking steps to avoid exposure to harmful substances, pregnant women can help to protect the health and well-being of their unborn child. In conclusion, a teratogen is an external agent that can alter foetal development and lead to birth defects or developmental issues. Pregnant women should be aware of potential teratogens and take steps to avoid exposure to them during pregnancy. By focusing on a healthy lifestyle and seeking prenatal care, women can help to ensure a healthy outcome for both themselves and their developing baby.

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