my baby boy is 10 days old. he is on formulae milk. if he sleeps , he will sleep continuously for 3 hrs . even if we try to wake him up for feeding, he just spits the milk in sleeping. he is taking 50 ml formulae milk with 3 hrs gap. he demands for hourly feed if he is not sleeping. he cries continuously if he doesnt feed for hour to hour (40 ml around) basis. is this normal in new born baby boys. should i worry about this.