Premature rupture of membranes means that the membranes have ruptured before the onset of labor, before the onset of regular abdominal pain, and the amniotic fluid has already flowed out. This condition is called premature rupture of membranes. Premature rupture of membranes can be harmful. Firstly, after the rupture of the membranes, the barrier of the membranes is gone, which can easily lead to infection. Additionally, after the rupture of the membranes, since the umbilical cord is still very slippery, it can easily fall out with the flow of the amniotic fluid. Once the umbilical cord prolapses, and if the fetal head compresses the umbilical cord, the fetus will not have blood supply, the fetal heart rate will slow down, or even cease, leading to fetal death in utero, etc. Therefore, after the occurrence of premature rupture of membranes, also commonly known as water breaking early, it is important to seek medical attention promptly.