Yes, he has tried both foods already and has no allergy. Thanks, will try to mix it and see if he likes it....Has your baby tried either one of the food items? If she has tried and has not shown any allergic symptoms, you can mix the fruit puree with the cereal. If she develops any allergic symptoms, you'd know that it's the new food that is the problem. Other than worrying about food allergy, there's really no rule to say that you can't mix fruit puree with cereal In fact, your baby may like it even more coz the cereal will take on a fruity taste!