Poor baby. My 17 month old also had no rashes to speak of, and I was being all smug about it, until one day, boom, she had a couple of nasty blisters. I blamed the fact that she was in dh's care all day one day, and he often spaces out changing her diaper for quite a while. Some days I come home from work, and if he's been with her all day and not the babysitter, who is very attentive to the diaper changing, her diaper will be sagging almost to her knees and completely soaked. He just doesn't notice. I plastered the California Baby Calendula cream on it for a few days and that did the trick. Also I let her run around without a diaper if we're at home for a few hours. Yesterday I did that and there was a puddle. I can deal with it because we happened to have the rugs rolled up since we just had some work done on our apartment. I tend to use cloth diapers on the weekends when I'm at home with her and use disposables when her dad and the babysitter are with her. I think the all day in a disposable with no change is a bad combo. I don't know about the diet, could be. But the thought of a blistery rash with stingy pee on it--owie!