In fact adult vegans do cheat every now and then. They just can’t help it because the human body needs some meat. Children don’t have the luxury of that, however; they have to eat only what their parents allow them. I say this from experience of a liberal family member.
It was just scary seeing a kid go nuts over cheese and grapes, when his mother gave him permission to eat the cheese when she started eating it.
The toddler was starving for it.