Solving the problem of sitting up on the changing table

Our changing table has restraints but it's hard to buckle Astrid down (which she hates) AND change her diaper at the same time. But we can't let her sit up because she could fall over the side (as she did once). So we solved the problem by having a toy on the changing table that she can play with (while lying down) while we change her diaper. We swap toys and bring in a new one (or one she hasn't played with in awhile) when we see her getting bored with the toy.