The fetal period is the stage of prenatal development that begins at the end of the embryonic period (around 8 weeks after fertilization) and continues until birth. In humans, the fetal period typically lasts for approximately 30 to 38 weeks, or around 9 months. However, the exact duration of the fetal period can vary depending on factors such as genetics, maternal health, and environmental factors. During this time, the fetus undergoes significant growth and development, with all major organs and body systems forming and maturing to prepare for life outside the womb.