Social & Preventive Medicine obstetrics,pediatrics and geriatrics f75d9dab Perinatal period is defined as - A From 20 week of gestation to bih B From 28 week of gestation to bih C From 28 week of gestation to one week after bih D From bih to one month after bih High-Yield Explanation Perinatal period is defined as from 28 week of gestation to one week after bih. REF. PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICAL 21ST EDITION. PAGE NO - 519