What do you call a pediatrician specializing in neonatal-perinatal medicine?

Neonatologists. neonatologists are pediatricians who specialize in treating newborn children who require higher level care, typically in a neonatal intensive care unit setting. To become a neonatologist, a doctor must complete a residency in pediatrics, and then a fellowship in neonatology. Further specialization can be done after neonatology.