Prenatal exposure refers to the influence that substances or environmental factors have on a developing fetus during pregnancy. This can include exposure to drugs, alcohol, tobacco, certain medications, and environmental toxins. Such exposures can affect the fetus's growth and development, potentially leading to physical, cognitive, or behavioral issues after birth. The effects of prenatal exposure can vary widely depending on the timing, duration, and type of exposure. For example, Fetal Alcohol Spectrum Disorders can result from alcohol consumption during pregnancy, while exposure to lead or mercury can lead to developmental delays. Understanding these risks is crucial for promoting healthy pregnancies.