Have to confess I switched bottles again to MAM, and these seem to work better for her, have started off on the medium flow but will try the faster flow today, I agree with you that a break of 15 mins or so often works wonders, aren't they funny, I guess they just get tired sucking. She drinks four hourly but rarely will take more than 5oz, although occasionally 8!!! I guess I just have to go with it.