Poor kid, how awful! im glad you figured out what the problem was.
Does he have a gluten allergy too? Thats pretty well-known these days but when I was growing up nobody knew there was such a thing. And gluten was in just about everything kids eat.
Better version so far.
https://www.youtube.com/watch?v=1IopfAyp6ZM
White House unveils 2019 Christmas decorations