K.J.
Hi S. I had the same problem. Our pedi. told us to take the bumper out & not use it at all, but then a few times her arms & legs would go through the slats. So I got a mesh "breathable bumper" & it has enough slack where you can run it around the back side. It's not as pretty as a bumper but it's so much safer. Once he starts moving around that bumper won't have a chance anyway. You can get the mesh one at Babies R' Us. in diffrent colors. Good Luck.