Almost 1 year old has diarrhea... why???

Gi

This will be the 3rd day. I started him on whole milk a week ago. And just recently he started having diarrhea. It's yellow / tan. He's had no problem whatsoever with his milk-based formula. He has no fever. What is wrong? What should I do? I've been trying to give him more water to hydrate him.

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