My boy was 4 months last week, great wee baby so far, sleeps pretty well and feeds like a champion. We are at the stage were we are trying to get him out of the habbit of waking up at 1am when he's not even hungry as he's up at 3am for his actual feed, apart from that he only really moans when he's hungry.
As with the above suggestions, the Tommy Tippee prep machine and the sleepyhead are absolute life savers, a must in my opinion! I would also highly recommend buying a few Swaddles, we found wrapping him up in that before his sleeps was a game changer, without that he would move in his sleep and his hands slapping his face would wake him up.