He sleeps really well so he isn't tired and I don't feed him every time he cries anymore but I did that for the first few weeks and then realised feeding every 2 hours wasn't good for either of us. I thought it was a growth spurt too which is why I decided to just change his night time bottle to hungry baby which has really worked he's back upto 5-6 hours sleep followed by 4 hours which is what he was doing before. He's still having about 36 oz a day but he's " under" weight for his height so I'm letting him feast whilst he wants it every four hours.