It is when the potential for generalizations like this arise that I feel the need to say--There are jerks and morons everywhere.

Are there unhealthy vegan children?--Yes.

Are there unhealthy vegetarian children?--Yes.

Are there unhealthy omnivore children?--Yes.

I highly doubt these people were truly vegan anyway. Vegans try to avoid causing suffering to living beings. They were NOT doing that for their son.

They sound like fools who jumped on a bandwagon (in this case veganism) because it sounded cool without doing any of the research that goes into what it really means to be vegan, etc.