The belly button pain in the 5th month of pregnancy may be caused by the enlargement of the uterus after pregnancy, the abdominal wall being stretched and the muscles of the abdominal wall being elongated or the rectus abdominis muscle being separated. No need to be nervous, pregnant women can gently massage to alleviate the symptoms, but if the belly button pain is accompanied by bloating, diarrhea or nausea, vomiting and other symptoms are considered gastroenteritis, it is recommended to go to the hospital for examination, you can take oral bifidobacterium triptans capsules to promote digestion. During pregnancy, pay attention to dietary hygiene, do not eat raw, cold, unclean food, and do not eat spicy and irritating food to avoid stimulation of the gastrointestinal tract.