Amniocentesis, or amniotic fluid puncture, is a procedure in which a thin needle is passed through the abdominal wall and uterine wall of the pregnant woman under ultrasound guidance to enter the amniotic cavity and extract some amniotic fluid for examination, which is an invasive operation and can cause some damage to the fetal membrane. The needle opening is small and the doctor will apply gauze pressure for 2-3 minutes after the puncture to promote wound healing, and the fetal membrane itself is resilient, so the recovery time is faster than the skin. In general, the membranes of most women heal within 7 days of the puncture. However, if there is an infection at the puncture site or if the woman is malnourished, the healing time may be longer. If the membranes do not heal, they may provide a pathway for bacteria to enter the fetal cavity, increasing the risk of infection, and may also lead to leakage of amniotic fluid, which may reduce the space for the fetus to move, resulting in fetal growth restriction and intrauterine distress. After the amniocentesis, the pregnant woman should observe for a period of time and leave only if there are no abnormal symptoms. You should not bathe for 24 hours after the test, and the wound should not be exposed to water to avoid infection. If symptoms such as abdominal pain, bloating or fever occur, you should go to the hospital immediately.