From PBS Newshour:  "Belgium has the world’s most liberal law on physician-assisted suicide, which is not just for the terminally ill. Patients with psychiatric conditions – and now, even children – can request euthanasia."  

A great many of these people are perfectly capable of committing suicide if that's what they want to do - and before anyone says, but 'oh! they may botch it up', quite frankly there's so much information available they'd have to be pretty dumb to botch it up.  And if they do... isn't that still better than making someone take on the weight of killing them? Does one person's right really trump another's?  Or is killing someone supposed to be something you do without having any impact on your psychological state?.

As for the idea of children with psychiatric conditions requesting euthanasia - I'm not even going to go there.