The duration of contraction pain after the second childbirth is about 3-5 days, the longest will not exceed 1 week, the specific duration also depends on the physical condition of the mother and the ability of the uterus to recover. Regardless of whether it is a natural birth or a cesarean delivery, the uterus needs to gradually recover from about 1000g after delivery to about 50g in the unpregnant state, and the uterus shrinks through the contraction of the uterine muscle fibers, at which time postpartum contraction pain will occur due to the strong contraction of the uterus. Under normal circumstances, most contraction pains appear within 1-2 days after delivery and last for about 2-3 days. In the second child, because the uterus becomes less elastic, the uterus needs to contract more intensely to return to the state it was in when it was not pregnant, so the contraction pains will be more intense in the second child, but they usually do not last longer than 1 week. If the pain is severe or lasts for a long time, you should go to the obstetrics department of the hospital for ultrasound and other examinations to find out the cause and then carry out symptomatic treatment.