Sleep hours of 1 month old Baby

15/March/2021. My son had turn 1 month old 9 days ago, and the milk volume has increase from 2 oz to 4 Oz. However the sleeping hours is not consistent as he only sleep 3 to 3.5 hours only. According to studies and research it supposed to be 4 hours. Any one had experience in baby sleeps growth? Please advice. #advicepls #firstbaby #theasianparent_my #theasianparent_sg #theAsianParent