A pediatrician may be a child's physician who not only provides acute or chronically ill children with medical aid, but also provides healthy children with preventive health services. At every stage of development, in both sickness and health, a pediatrician manages the physical, mental and emotional well-being of the youngsters under their care. Neonatology may be a pediatric subspecialty consisting of new born, infant’s medical aid, particularly the ill or premature newborn. It's a specialty based in hospitals and is typically practiced in intensive neonatal care units (NICUs).