Hi L.! It could be many things, and maybe even nothing at all. My daughter is a little over 2 now, and she has gone through many phases!!!! She could be teething which is making her feel very uncomfortable, or she could be bored with her usual foods. My daughter used to LOVE milk, and all of a sudden one day decided that she never wanted it again. My husband and I were so confused. Doctors said she was fine, and just to replace it with yogurt, lots of cheese, etc.. for her calcium. 6 months later, she is begging for milk all day again. If you would feel more comfortable going to the doctor for a check-up, than do what makes you feel you should do. Or... you can ride it out, and listen to what your daughter is telling you. Try some new foods, and you'll see, she'll probably go right back to her old routine. Good luck with everything, and God Bless!