OP- When DD was not eating very much, I actually bought a tin of formula just to make sure she was getting some extra nutrients as I was concerned that living on milk and a few arrowroot bickies at 15mths was just not good. Since then I have stuck with doing two formula feed a day and one cows milk. She could seriously take one or the other and is not fussed. Not saying you have to give formula but just what eased my mind a little.