A "preemie" is a term used to describe a baby born before 37 weeks of pregnancy are completed. Most pregnancies last about 40 weeks, so preemies are born too early, which can lead to various health challenges. They may need special medical care to help them grow and develop properly. Preemies can be classified into different categories based on their gestational age. For example, those born between 32 and 36 weeks are considered late preterm, while those born before 32 weeks are very preterm. The care for preemies often involves a stay in a neonatal intensive care unit (NICU) to monitor their health and provide necessary treatments.