Sleeping Pattern of Babies

My son is four and a half months now, but still I haven’t been able to figure out his sleeping pattern. He may sleep for hours during the day, or he will be playing through out. His sleep during night is very erratic too. He wakes up every hour to get feed. Earlier he used to sleep continuously for four hours during night. That was when it was a very cold winter. Now when the weather has turned warmer, he is getting up. May be it is because of theprotective clothing that I still use for him. Perhaps he feels hot in it now.