Carseat belts

Cunning, clever lil Kalyx is forever taking his arms out of his straps whilst in the carseat
Its a pain having to stop every 2 mins down the road to get him to put his arms back in .. Are there any devices/gadgets that could stop him sliding his arms out? Who has tried them, are they worth it? I need to do something. Advice?

Pulling over & telling him about the safety issues etc even using scare tactics re Police is hopeless- worked a dream with the oldest but hopeless with Kalz

I have the same problem but when i went to a few baby shops to ask if they had something to stop it (i know u used to be able to get a little clip type thing) they said they don't sell them anymore as it was a safety issue, hmmm arms not in straps is not safe either. sorry not much help but would love to know if there was something still available.

I have a houdini stop and it is brilliant! We put the gremlins in booster seats to stop them getting their arms out, I would have much rather kept them in harnesses for longer but it was too unsafe with them getting out.

When lil miss started escaping at the ripe old age of 10 mths, one of my colleagues suggested the Houdini Stop and it works brilliantly!

Yep that's it! Awesome- thankyou