Our little man is about 2 months older than your DD, and he has around 4 bottles still (one at 4am, one mid-morning, one mid-afternoon and one before bed). We are in the process of trying to drop the mid-morning one and he doesn't seem to mind not having it. To the best of my knowledge, none of my friends' or extended familys' kids who are the same age, are having nearly that amount and it had me worried at one stage. Now I realise that some of them like water instead (our little man doesn't care much for water) and others seem to be bigger eaters. Your little DD is eating solids and drinking heaps of water, which I would be very comfortable with if our little man was doing the same. I think as long as they are happy, not gaining or losing too much weight and still eating solids, you should continue to follow their lead and your instinct.