When my oldest grandson was crawling and just learning to walk, he hated the feel of grass - all grass, but especially freshly mowed grass. We would put him on a quilt in the front yard, and it worked as if the quilt had a fence all around. I think we could have left him alone for hours and he would not have left that quilt. That all changed when he became used to grass, then it was go, go, go.... And it did not work for any of the other grandkids.