If there is pain in the stomach two months after delivery, the most common cause is pelvic inflammation, because in the puerperium if you do not strengthen the local care of the vulva, the resistance is relatively low at this time, there will be bloody vaginal discharge, followed by plasma discharge and white discharge, do not strengthen the care may lead to the retrograde infection of pathogenic bacteria caused by pelvic inflammation, resulting in pain in the lower abdomen. If you do not take good care of your baby, it may lead to retrograde infection of pathogenic bacteria, causing pelvic inflammation and pain in the lower abdomen. If you have sex too soon after delivery, because the uterine cavity has not fully recovered to normal, premature sex will lead to local inflammatory reaction, so it will also cause pain in the lower abdomen. It is recommended to treat the pain with medication and proper rest, strengthen the nutrition, and enhance the vulva care after delivery. If you have a normal delivery, you can have intercourse after 56 days. If you have a cesarean section, you can have intercourse after 3 months.