My 3 year old son has started smelling like onion. what could cause this?

ASkunkInYourMidst!!: This is complicated and you'll have to do further research,but my guess is that it's nutrition(you'll figure that out quickly).Thiols are chemicals that can smell like onions and/or garlic.They may come from foods high in cystine,cysteine and methionine.The list is very long but it starts with egg white and ends with chicken.And guess what! The molecules in skunk spray and onions are very similar!