When the fetus is infected in utero, it will not only affect the pregnant woman with fever, abdominal pain, vaginal bleeding and other manifestations; but also will be detrimental to the growth and development of the fetus, which can cause fetal growth retardation and increase the chance of malformation, and it is also prone to complications after the birth of the fetus. 1, maternal impact: early infection of pregnant women may not have obvious symptoms, but with the development of the disease, fever, abdominal pain and other symptoms will gradually appear. 1, fever: in severe cases, the body temperature exceeds 37.5 ℃, or even reach more than 39 ℃, showing signs of retention fever or flaccid fever, can be accompanied by chills, increased pulse; 2, abdominal pain: pressure pain at the base of the uterus, this pain is continuous, when there is no contraction is present, with contractions when the pain level increases; 3, abdominal pain: the pain is continuous, when the pain is not present. Vaginal bleeding: intrauterine infection causes inflammation of the chorionic membrane and amniotic membrane, which induces uterine contraction and premature rupture of the fetal membranes, which can lead to preterm labor, thus manifesting as vaginal bleeding and abdominal pain. Second, the fetal impact: the infection spreads further, the amniotic fluid becomes cloudy, the fetus is infected in the uterus, resulting in delayed development and increased chances of malformation, and in serious cases, it can lead to fetal death in the uterus, the most obvious manifestation of which is the disappearance of fetal movement. Even if the fetus is born normally, the newborn may be drowsy and poorly fit, and in serious cases, sepsis and septicemia may occur, which can be life-threatening.