A.B.
When my daughter was around the same age I wanted something that would help the transition from baby tub to regular tub. I ended up buying an inflatable duck tub from Target for $10 and it worked perfectly. I just filled it and put it in the regular tub. It kept her in one place and she couldn't tip over and hit her head. I used it until she was about 11 or 12 months, I think. At that point she was ready for the regular tub.