Social & Preventive Medicine General 46c6c853 Perinatal period is defined as – A From 20 week of gestation to birth B From 28 week of gestation to birth C From 28 week of gestation to one week after birth D From birth to one month after birth High-Yield Explanation Perinatal period includes : (i) Late fetal period (from 28th week gestation onwards) and (ii) Early neonatal period (1st week of life).