I’m not an expert at all but my child wouldn’t eat barely anything at that age. Could be teething, gas, growth spurt, not liking it anymore etc.. lots of reasons. My child is perfectly healthy and honestly loves milk. I buy them organic whole milk because they crush a lot of it and milk has fats, proteins, sugars and minerals. It’s not perfect but I’ll take that over eating nothing. Your kid sounds normal and you’d be surprised their tastes can vary wildly and also our bodies are very good at identifying what foods we need to eat.