In the third trimester, if the ultrasound indicates a low placenta position, intervention is usually not necessary. This is because, at this time, there are no therapeutic measures and no interventions that can be made. The position of the placenta is mainly divided into the anterior wall, posterior wall and fundus of the uterus. If the position of the placenta is low, as the gestational weeks increase and the uterus grows, the placenta will gradually rise, that is, move closer to its normal position. However, some placentas can grow up to the position of the uterine fundus, and some placentas cannot grow up. At this time, it is necessary to observe, first, whether there is bleeding, and second, to observe the position of the placenta. If the placenta can grow up after 28 weeks of pregnancy, there is no problem.