Birth defects, also known as congenital defects, are physical or developmental abnormalities present at birth. They can affect any part of the body and can range from mild to severe. Common birth defects include heart defects, cleft lip and palate, neural tube defects, chromosome abnormalities, and limb malformations. The causes of birth defects are complex and vary from case to case. In some cases, birth defects are caused by single-gene mutations or environmental factors, such as exposure to certain substances or viruses. In other cases, multiple factors may be involved. Most birth defects are present at birth, but some can develop later in life. Early detection and treatment of birth defects can often prevent or reduce the severity of the defect. Treatment for birth defects may include surgery, medications, physical therapy, genetic counseling, and other therapies. Preventing birth defects involves reducing exposure to environmental toxins, eating a balanced diet, taking prenatal vitamins, and avoiding smoking, alcohol, and drugs during pregnancy. Regular prenatal care is also important for monitoring the health of the mother and fetus. Research is ongoing to better understand the causes and treatments of birth defects. It is important to be aware of the risks and to take measures to reduce.