Diagnosis of preterm labor involves clinical assessment and monitoring of uterine contractions and cervical changes. Management strategies for preterm labor include the use of tocolytics to delay labor, administration of corticosteroids to accelerate fetal lung maturity, and magnesium sulfate for neuroprotection. In cases where preterm birth cannot be prevented, neonatal intensive care units (NICUs) play a critical role in providing the necessary support for survival and growth.