Neonatal period extends up to –

Neonate (Newborn) From birth to under four weeks of age (< 28 days), the infant is called neonate. The neonatal period has been further subdivided into - Early neonatal period  → the First week of life (< 7 days) Late neonatal period → 7th to < 28th day Term neonate (term baby) Any neonate born between 37 and < 42 weeks (259 - 293 days) of pregnancy irrespective of the birth weight. Preterm baby Any neonate born before 37 weeks (<259 days) of pregnancy irrespective of the birth weight. Post-term baby Any neonate born at or after 42 weeks (294 days or more) of pregnancy irrespective of the birth weight.