The phrase “when the melon is ripe, it doesn’t fall” is a graphic metaphor for a pregnancy that is overdue. Overdue pregnancy is defined as a pregnancy that has not been delivered after 42 weeks of regular menstrual cycles, i.e., two weeks beyond the expected date of delivery. At present, the cause is not clear, may be related to heredity, too much progesterone in the pregnant woman’s body, the uterus is less sensitive to oxytocin, etc., which accounts for about 2.5~17.4% of the total number of deliveries. Is overdue pregnancy a blessing or a curse? Many people believe that the longer the fetus is in the mother’s body, the bigger it grows, and the stronger it is after birth, isn’t that better? In fact, not, expired pregnancy on the mother and the newborn baby have many adverse effects. “The melon ripe not fall” on the mother and child harm are: 1, placental function is insufficient The placenta and other organs, as well as a certain period of life, more than the period of placental function will decline rapidly, as the melon atrophy, dry as well. Overdue pregnancy placental function aging, some of the chorionic vessels of the placenta infarction, so that the fetal hypoxia and nutrient deficiencies. The over-mature fetal nervous system is poorly tolerant to hypoxia and is prone to fetal distress, asphyxia or death during labor and delivery. Due to hypoxia, can also cause fetal anal sphincter relaxation, so that the meconium discharged into the amniotic fluid, so that the amniotic fluid becomes turbid, in the process of labor and delivery, the fetus inhaled meconium mixed with amniotic fluid, easy to cause aspiration pneumonia in newborns. 2, fetal malnutrition overdue pregnancy fetal nutrients are insufficient, fetal development stops, excessive self-consumption, weight not only does not increase, but also reduce. Due to the reduction of subcutaneous fat, skin folds increase, seemingly “small old man”. In addition, because of the lack of oxygen in the uterine cavity, there is fetal feces discharge, mixed with the amniotic fluid so that the fetal skin stained yellow. 3, the amount of amniotic fluid decreased overdue pregnancy amniotic fluid, amniotic fluid is too little pressure around the uterus will play a direct role in the fetus, the fetus can occur muscle deformities, malformation of the foot, pulmonary hypoplasia; amniotic fluid is too little, sticky, the birth canal lubrication is not enough, the fetus in the process of delivery of the descent of the obstruction, which can prolong the process of labor, fetal mortality rate is high. According to statistics, the prevalence rate of newborns born during term pregnancy is 3.5 times higher than that of full-term babies, and the mortality rate is 2 times higher than that of full-term babies. 4, difficult to increase Overdue pregnancy, if the placenta function is temporarily normal, the fetus can continue to get adequate nutrition, continue to grow and develop, and finally form a huge child, so that easy to cause obstruction of labor and delivery of the fetal head, fetal shoulder diameter is more enlarged. In addition, the cranium of the fetus hardens and does not easily deform, all of which significantly increases the difficulty of labor and is prone to complications such as stagflation, rupture of the mother’s uterus, laceration of the birth canal, and postpartum hemorrhage. Due to the increased chances of obstructed labor, the chances of surgical assisted delivery are also significantly increased, and it is also easy to cause complications such as intracranial hemorrhage, clavicle fracture of the newborn, and even cause the newborn’s mental retardation and other long-term sequelae. From this we can see that in the case of overdue pregnancy, the “melon tip atrophy” can make the “ripe melon” dried up or even rotten. Even if the “melon tip” is temporarily normal, it can also cause difficulties in labor and delivery. Since childbirth is different from picking a melon, it is important to deal with overdue pregnancies in a timely manner. The best way to deal with an overdue pregnancy is to end the labor as soon as possible, so that the ripe melon can be removed from the tip as soon as possible. However, there is still a lack of reliable clinical methods for the diagnosis of overdue pregnancy, so labor cannot be induced solely on the basis of the due date, but must be combined with clinical examination, comprehensive analysis and careful consideration. If it is confirmed that the pregnancy is overdue, the fetus is large, the skull is hard, and the amniotic fluid is small, especially if it is a primiparous woman of advanced age or if there is pregnancy toxicity, it should be actively handled, and the necessary placental function examination should be given, and the appropriate mode of delivery should be chosen, so as to make sure that the melon is ripe and the fetus is good.