Whether bacterial vaginitis can affect fetal development needs to be determined based on the severity of the vaginitis and the treatment. Mild bacterial vaginitis, after timely treatment, may have no effect on fetal growth and development if the bacteria do not infect the uterus and the lesions do not involve the uterus. However, if the inflammation is severe and the treatment is not timely, and the bacteria infect the cervix, uterine body or even enter the amniotic fluid, it may affect the development of the fetus. When there is an upstream infection, the probability of premature rupture of membranes, preterm miscarriage, miscarriage, intrauterine infection increases and the fetus may have limited intrauterine growth or even stop developing. When bacteria invade the chorionic and amniotic membranes, it can cause chorioamnionitis and amnionitis and an increased risk of premature rupture of the membranes, leading to preterm delivery. Also, when bacterial vaginitis develops during pregnancy, the probability of neonatal infection and neonatal jaundice increases, which directly threatens the health of the newborn. Pregnant women should seek medical examination after discovering the cause of the disease and choose the medicine that will have the least effect on the fetus under the guidance of the doctor, avoid sexual intercourse, keep the vulva clean, rinse with warm water, keep the perineum dry after rinsing, and change underwear regularly and expose it to the sun.