Do you not have activity time? I mean my babe is 11 weeks, he fusses a bit with the bottle but I still think it's cause he's uncomfortable and has reflux. But he sleeps well after a good 45 min of activity time. With long feeds, this may cut that time short, but at this age, they are so fun you find yourself playing with him so much you make him tuckered out! We cluster feed 6 8 and 11 and it works out really well. When he was going thru a growth spurt we gave him an extra oz for a couple of days and then went back to our normal amount. When I nurse, cause it takes longer also, I start a little early too.