So good to hear all this guys - my little chickadee is doing the same at 3 months and was pulling my hair out about what to do. she wakes up after a 40min nap and wants to be fed straight away. Tried keeping her up longer but grizzles and is obviously tired but yet won't sleep very long. Might give some of your top-up feed ideas a go. I am hoping its just growth spurt time?!