I had a similar scare when I first got my boy. When I first got him for the first few months at least he spent all his time on the hot side then randomly changed sides. My reaction was very similar to yours, I was scared I did something wrong, but he still ate just fine and didn't seem stressed and did a bit more research and learned that they just change sides sometimes. Now every few months or so he changes back and forth. Sooo what I'm trying to say is your little one should be fine ^-^
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