Fetal development refers to the process by which a fertilized egg grows into a fully formed baby. This process occurs in three main stages: the germinal stage, the embryonic stage, and the fetal stage. The germinal stage lasts about two weeks, during which the fertilized egg implants itself in the uterus. The embryonic stage follows, lasting from week 3 to week 8, when major organs and structures begin to form. The fetal stage begins at week 9 and continues until birth. During this time, the fetus grows rapidly, and its organs mature. By the end of the pregnancy, the fetus is typically around 20 inches long and weighs about 7.5 pounds. Proper nutrition and prenatal care are essential for healthy fetal development.