William is five weeks this week and he is consistant with three hourly feeds if not less...and he feeds for around 40minutes. he is putting on plenty of weight and the health nurse and lactation consultant has not told me its a bad thing rather it is normal (the feeds) and he is doing great(weight gains)....you know when your baby is hungry... i'd rather have a happy content baby than one that cries for two hours because you have to only feed 'every four hours'. and yes they are meant to have a growth spurt at four, six and eight weeks i'm pretty sure.