A cesarean section at 37 weeks gestation is not considered preterm labor.
Preterm labor is defined as a newborn whose gestational age is <37 weeks at the time of delivery. Gestational age refers to the period from the first day of the last normal menstrual period to the time of delivery, usually expressed in weeks, and is categorized as full-term, preterm, very preterm, and late preterm.
A newborn is full-term if its gestational age is greater than or equal to 37 weeks and less than 42 weeks, i.e., if it is born between 260 and 293 days of gestation; a preterm baby is born at a gestational age of less than 37 weeks, with babies born at a gestational age of less than 28 weeks being called extremely preterm or ultra-immature; and if the gestational age is greater than 34 weeks, and less than 37 weeks it is also called late preterm baby.
In conclusion, preterm infants have relatively more complications, especially susceptible to infections and respiratory diseases, so attention should be paid to the care of preterm infants.