Physiological Stages Neonatal period birth---4 Weeks Childhood, 4 weeks-- 2 years Puberty: 12 years--18 years Sexual maturation: 18 year---50 year Perimenopause. decline of ovarian function(40 years)----1 year postmenopause ° PostmenopausePhysiological Stages • Neonatal period: birth---4 weeks • Childhood: 4 weeks----12 years • Puberty: 12 years---18 years • Sexual maturation: 18 year---50 year • Perimenopause: decline of ovarian function (40 years)----1 year postmenopause • Postmenopause: