When Lyla succeeded in bypassing her crib bumper and getting her arm stuck in the slats of her crib, I went on a quest to find a sturdier bumper. Never found one I liked, so I decided to make one. Of course, I bought foam, cut it up, THEN read the package where it said it is "toxic when burned, DO NOT USE FOR BABY CRIBS."
So I ended up using NuFoam. Not quite as studly as I was originally going for, but it should take Lyla a few days at least to break through to the slats again!