oh my goodness! this describes our wee one exactly! I have worried so much over this as it seems most people on here are worrying their LOs are drinking too much! M is 15 weeks and around 13lbs. SHe should therefore be having 33oz per day but she only takes 24-30, some days she only takes around 22! I have tried everything to get her to take more but she just won't and just like you describe, some feeds she takes next to nothing (sometimes as little as 1-2oz) and then other times she takes 6oz! we waste so much milk, not that this bothers me, but it is just so difficult to know when she has had enough, when she's hungry or when I should continue trying to make her take a bit more as some days after initially only taking 1oz and flat refusing anymore, she will take another 3oz or so after 10mins or so, whereas other days she will jsut stick with an oz! I keep being told not to worry and that she will take what she needs, but it is hard not to. She sleeps a lot and i wonder whether its cos she doesn't have enough energy and she also is only putting on weight very slowly and has gone from above 75th centile to below the 50th. Anyway, just to say, I have no idea how to get them to take more, sometimes playing swapsy with her dummy works (letting her suck her dummy for a bit and then pull it out and stuff the bottle in - it seems to put her in the sucking mood) - its nice to know we're not alone tho xx