My 7 month old has an itchy rash on his belly. It's been there for a couple of months and some days it seems worse than others. Could this be a food allergy that I missed? I haven't changed detergents or anything. I switched his soap to Cetaphil because it's supposed to be more mild. He's been eating solid food since 5 1/2 months...but just the basics. Rice, oatmeal, apples, bananas, sweet potatoes, peas, green beans, peaches, squash and plums. Any ideas? Thanks in advance!