Are you allowed to ship and use an American seat?
Yes, Swiss law states that we can use a seat that meets or exceeds Swiss (or European) safety standards. Don't forget Switzerland is not part of the EU.
Even if it was "illegal" my children are my responsibility and it would be *me* who would pay in guilt and tears if something happened to him and he was in a booster that was too big for him, not the law (obviously). Since the only seats available here are of inferior safety and inappropriate for
my own child, I'd take the risk and if I got in trouble I'd fight it out in court. My son is a *small* four year old (born at 29 weeks) and has mild cerebral palsy affecting his ability to walk by himself, he needs a harnessed seat, they don't have one that does the job (harnessed over 18 kg). I'd never suggest someone else do it, as a professional, but since he's my kid... it's my responsibility.
Why would I be *not* allowed to ship a seat? My mum mails stuff for me often and we've shipped car seats before. No biggie.