My DS is 10 weeks old and have just changed from mam bottles to Dr Brown due to problems with wind. The Dr Brown bottles are definitely helping with wind, but I can't seem to get him to finish the bottle. Before he was drinking 7 ounces, now I can only get him to have 4/5. I don't know if it's because Dr Brown are slower release so he's having to work harder for it and is tired and fuller. Has anyone else had this or similar?