Try to be calm because being calm will reassure him. Also, try to blend or process his food. He might appreciate a fruit sauce. Perhaps you could blend together blueberries, strawberries, an apple without skin and a few blackberries. Then chill it and give it to him. This way he is eating something tasty,fun,and nutritious. Try processing or blending squash and serve warm with a topping of brown sugar and nutmeg. I hope he or she feels better.