I bought a baby walker at Walmart store I put my 11 month son in and he was trying to walk in it the...

I bought a baby walker at Walmart store I put my 11 month son in and he was trying to walk in it the walker wheel wouldn't move going forward and it tipped over on him witch was very dangerous the way the walker landed on top of him he could have broken his back and neck. So I'm filling a complaint .