Premature babies are born too early, the development of various organs of the body is not perfect, so the function of various organs may be impaired, and some may have some complications of premature babies. The earlier the child is born, the greater the impact caused by the preterm baby resistance is relatively low, due to the lack of lung surface active substance caused by pulmonary hyaline membrane disease, neonatal pneumonia, neonatal necrotizing enterocolitis, neonatal weight loss, neonatal hyperbilirubinemia, neonatal hypoglycemia, neonatal electrolyte disorders and so on. After birth some preterm infants develop respiratory distress and may have neurodevelopmental problems. Long-term complications include neonatal mental retardation, behavioral dysfunction, cerebral palsy, cognitive impairment and even inability to take care of himself in his daily life, or affect his health and normal growth.