Hi experts, My baby was a preterm baby with breastfeed plus formula in the initial stage after 2 month he is exclusively formula fed baby. He used to take feed for every 4 hours gap but for past 2 said he used to sleep n for 8-9 hours in night and taking feed as usual in the mrng of 4 hours gap and he won't sleep in thr day time . Is this normal to sleep for 8-9 hours or o should wake him and give feed on the night