Toddler wriggling out of car seat

[StillMedusa]

Toddler, 21m has a Joie 360 spin.
Straps are pulled tight as they will go, but she has developed some super skill of wriggling her shoulders slightly until she can squeeze one arm out.. then the other. I think it's because the Joie straps are actually quite wide apart , because she can't do it in her other car seat at Nana's house (a BeSafe ERF) only in the Joie.
Has anyone else experienced this and other than getting another (!) seat is there anything we can do?

@Clevs l had a hire car once than actually didn't work unless all the seatbelts were done up.

@StillMedusa we had one of these anti escape harnessess*. It didn't stop dd getting out entirely, but it slowed her down a lot. In combo with a Charlie and Lola cd to distract her, we could do 20-30 min journeys safely. We have since discovered that dd has double jointed shoulders and can bend and wriggle into unnatural positions, which probably helped her car seat escapology massively.

Safer than her not fully being in her car seat, I would imagine!

Yeah my daughter did it once, I shouted so much she has never done it again. She was over 3 though so understood what I was saying. Yours may be too young to understand reason.

BertieBotts thank you..that is really helpful!