The reason for the slight pain under the belly at 39 weeks of pregnancy. It is possible that this is a sign that the baby is going to be born, because this is already in the prenatal period, during which you need to pay attention to observe that when the baby is going to be born, there will be regular contractions and pain in the stomach, accompanied by a feeling of tightness and hardness in the stomach. If there is only a slight pain, the situation needs to wait for time, indicating that it is not yet ripe, it should be due to the enlargement of the uterus to the pelvic cavity, resulting in poor blood circulation or the fetal head into the pelvis after the pressure on the pubic bone, resulting in pain in the pubic bone caused by this feeling. During this period, you need to relax, do not be too nervous, pay attention to the change of fetal heartbeat, if the fetal heartbeat is normal, then you can safely wait for delivery, if there is a fetal heartbeat is not normal. If the fetal heartbeat is not normal, then you can wait for delivery without worrying about it. Give the pregnant woman oxygen in time to avoid intrauterine ischemia and hypoxia.