My 3 month old nurses for a very long time (30-40 min per breast). She doesn't nurse efficiently - she sucks a little rests sucks a little and she seems to have no energy when sucking. Many times she just falls asleep on breast then she is hungry 20 min later again because she didn't get all the milk out. So she doesn't even empty the breasts. She had her tongue tie clipped. She is not gaining weight as fast as pedi wants her to and they are about to put her on formula but I keep fighting it because I want to exclusively breastfeed her. I saw 3 LCs and none of them could solve this. I saw a pediatric GI. No one can help me. Please help!!!