dd aged 2.9 can now very easily press the red button on her car seat to release the straps. She will do this at any opportunity - usually when we have stopped but also when driving along. Someone suggested putting her in a harness and then tying that to the car seat. However I can't see where to tie the straps and besides this would make it very complicated to get her out of the car seat and time consuming which is surely not safe in case of an emergency.
There seems to be plenty of seat beat covers available to prevent children undoing their belts but these are just for standard car belts not for car seat ones.
I have obviously tried asking her not to do it but she just thinks its funny and distractions just don't work for long enough. Any suggestions? Thanks.