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For many “picky eaters” sensory processing plays a big role in their refusal to eat foods. Simply put, if something feels gross in their mouth or on their hands, they aren’t going to eat it.  The fancy therapeutic term we give for this is tactile defensive.  Clues that your child may be refusing foods because they are defensive are: gagging, squirming, or seeming frightened by the sight, smell, touch, or taste of a particular food. Oral aversion also fits into this category.
Its because most the kids are playful and their appetite is less 
if ur to see most of the kids they eat in instalments or they eat in beats they dont eat alot of food at ago, they eat little and then they do other work 
and at times it does happen that most of the times the kidsare not able to digest the food that is given to then so they dont eat the food 

i think this will hlp