This appears to be a form of what is know as 'food aversion' and does not really require any further investigation. You know which foods seem to worry him and which he does not like to eat, so avoid these foods in his diet. Give him a long period off the foods he does not like,probably until he is 3 years old and then try one of these foods at a time and see if he will tolerate them.He is happy and growing well which is a good sign.
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