oh wow, yeah. That's really not cool.
But people say this stuff about newborns - ignore them even if they cry till they vomit, they're just after your attention. (well, yes, of course they are! they need you)
And if a kid is deliberately making themselves vomit or wee or whatever, there's a darn good reason for it. Just to **** you off? Well, maybe; maybe that's how they've learned from you how to get your attention. Maybe they're so distressed and alienated, or whatever, they've nothing else left to get what they need from their carers.
I've only heard good things about 123 before, but it never appealed to me based on what I'd heard. I'm not big on punitive punishments.