The second child’s nightmare is usually drained in about 4-6 weeks, but the time to drain the nightmare varies because the contractions of the uterus recover differently after childbirth. The first 3-4 days of recovery of the uterus after delivery is bloody nightmare, then it will turn into plasma nightmare in the next 4-14 days, and the last white nightmare will last about 3 weeks. However, in some women, due to the slower repair of the endometrium at the placenta attachment site or the weaker contraction of the uterus, the time of discharge may be slightly longer. However, in general, most of the mothers will be able to clear the dew within 42 days, while some mothers with abnormal delivery or cesarean section can extend the dew time, but it should be clean in 56 days. If the mother still has nightmare after 56 days, she should go to the obstetrics department of the hospital in time to receive symptomatic treatment according to the doctor’s prescription.