We've been giving my LO exclusively Pumped BM. Lately, it has been a struggle to feed him. After an ounce or so, he would start squirming or crying or thrusting out his tongue, sometimes even blowing raspberries. We would switch position, change location, make funny faces etc to try to get him to drink his milk. This would work but only for a short time. He was previously still on a level 1 nipple by born free so we thought maybe it was too slow for him so we are currently transitioning him to a level 2 but even with that, it still is a struggle. It takes about 45mins at least for him to finish his bottle. He just had his 4th month growth spurt so we increased his milk to 6oz per meal, 6x a day. Heis back to sleeping through the night after about 2nights of waking up hungry for a NF. But im really at a loss as to why it is becoming more and more difficult to feed him. He does finish the 6oz so at least we are ok in that aspect. Is this usual? Is it going to pass? Any thoughts? Thanks!