My absolute favorite slippers for babies (from roughly 0 to 2 years) are these UGG Bixbee slippers. They’re easy to get on, they stay put, and they have little grippers on the bottoms that keep little ones stable once they start walking. I desperately wish they would expand the size range beyond size 5, because we would have kept buying them throughout toddlerhood. Nevertheless, once our kids grew out of their biggest size, we switched gears to LL Bean’s offerings and we have two favorites: the cozy slipper booties and the Wicked Good slippers. The girls love both, and the latter has a rubber outsole that provides good traction.