My little guy is 1 month old and was 9 lb at his appointment earlier this week. He has been eating 4 oz every 4 hours (formula fed). Past couple days, he seems more fussy. He usually will eat the whole bottle and then want his pacifier after. He very rarely spits up and burps well. Should I increase to 5 oz? When should I let him sleep? He has been on a schedule since he came home, so I want to keep him on it. I don’t want to take steps backward (so on-demand isn’t going to happen).