a pool noodle! That's right, it's just a pool noodle cut in half (so you actually will get two covers out of one noodle) and cut down the middle. It slips right over the shopping cart so baby can't gnaw on the metal bar. Now's a great time to pick up one of these noodles.
We found this great idea over at It's Not Always Black and White.
(Image: It's Not Always Black and White)