My baby can escape her maxi cosi. We had this with my older child, but later. We could explain things to him and worked through it.
The tiny houdini is so good with movement. She can climb, run, stick wee fingers where you just would not think of. She has been walking from 7 1/2 months.
She has worked out how to wriggle one arm free (no matter how tight the straps) , and then she uses the space to get the other out. Then she actually sucks in her wee tummy; pushes with her hands and feet, and squeezes out. It has happened twice, witnessed by my older child, who was freaking out.
She is strapped in as tight as I can get. I have been super lucky my older child told me what was going on. I don't want to drive alone with her. She is too wee for the next seat size and I am worried that would give her more room. I see straps to attach, etc, available, but then safety advice against them.
But then, secure is obviously better than crawling around the back seat. That is where I am worried might go. She is 13 months old and too wee to reason with.