Belly button pain in pregnant women may be caused by uterine contractions, excessive fetal growth, intestinal cramps, gastrointestinal disorders. 1. Uterine contraction: pregnant women with uterine contractions produce symptoms of stomach pain, the pain may be in the navel, you need to observe whether there is abnormal vaginal bleeding, abdominal pain, if necessary, should be timely medical care to protect the fetus. 2. Fetal growth is too fast: in mid-pregnancy after the rapid growth and development of the fetus, the uterus will gradually increase the size of the belly, the belly has a feeling of being open, will also feel the belly button pain. 3. Intestinal cramps: pregnant women eating frozen, irritating and spicy food may cause intestinal cramps, which may cause the symptoms of belly button pain. 4. Intestinal diseases: Intestinal invasion by bacteria and viruses may cause acute enteritis or appendicitis, which will also show the symptoms of belly button pain. The causes of belly button pain in pregnant women are many, and it is recommended to seek timely medical attention for serious cases.