Stop this bad mummy talk! Lots of wet nappies is the best sign that he's getting plenty of milk. 2hourly feeds is good - how many would he be having?
Up at 6 in bed by 8 so about 8 feeds, maybe a couple less depending on if he sleeps through the day.
His arms and legs have actually filled out since he was born, he use to have skin rolls instead of fat rolls and his face has filled out too, so I know that he is fine.... I must stop listening to people who say otherwise!