Sarah I have always had this problem when Matilda is sick, I just try to feed smaller amounts more regularly, so I would give her 100mls heaps more often, or even try diluted fruit juice. The GP had me make up heaps of aeroplane jelly for her to get fluids & sugars in for the days that she wouldn't eat at all and I would put in some of the golden circle pears as well chopped up. I also make heaps of smoothies and ice blocks for her. So I've put some of the smoothie recipes up in the smoothie recipe section and I then freeze that into ice blocks for her to eat when she's sick. So far today she missed one meal but ate 2 ice blocks which has frozed formula, yogurt & fruit, so I don't feel as bad. HTH!