My daughter 6 months now and she is too big for her infant bathtub, so we are transitioning her to the big tub, but she slips and slides in the bathtub. She is pretty good at sitting, but still could use a little support. It's hard for me to hold her and bath her. I noticed you cannot buy the bath rings anymore. Does anyone have any good suggestions as to what to do now or where to get a bath ring? I saw blow up bath tubs, but really would prefer to not use one of those.