I've heard that some people do not heat up the baby food or other food for babies. The food is always cold, straight from the refrigerator. Is this healthy?

This is not so much a matter of health, but a matter of preference. It is perfectly safe and healthy to feed your baby food straight from the refrigerator as long as the food is thoroughly cooked and has been stored properly.

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Depending on what kind of puree. For fruits I always serve right from fridge