Preterm labor is usually defined as a woman who has been pregnant for 28 weeks but has given birth at less than 37 weeks. There are many causes of preterm labor, including localized bacterial infection, which can cause premature rupture of membranes, or chorioamnionitis, which can lead to localized infection in the uterine cavity and abdominal pain, as well as amniotic fluid flow. Preterm labor can also occur with bacterial vaginitis or urinary tract infections, most commonly urinary tract infections or pyelonephritis. Preterm labor can also be triggered by abnormal placental function or overdistension of the uterus. For women with uterine malformations, such as the common stumpy uterus or longitudinal uterus, preterm labor may occur in late pregnancy. Since there are more complications after preterm delivery and the chances of survival also decrease, it is necessary to try to preserve the fetus in the event of preterm labor. And after preterm delivery, it is often necessary to send the newborn to the neonatal unit for warmth and rescue.