Not such a great idea

So Charlie can pretty much sit by himself-on a nice sturdy floor-but not so much in a slippery bathtub. He refused to lay back in his infant tub, instead he forces himself forward and goes facefirst into the water over and over again. I was shopping for a bath seat with no luck and saw the bumbo seat which looked like it could do the job and then some. (I picked it up cheap at a consignment shop) John and Danielle said it was like an awesome little baby jail seat that your child cannot escape so I knew I had to have it! Here is the problem-it floats better than any lifejacket on earth and even my extremely rotund son cannot hold it down (hard to believe, I know). Back to square one. We don't own a scale so Bryce held Charlie on the WII fit the other day and it said something along the lines of "Bryce, I see that you have brought something to the balance board which weighs 18.8 pounds, am I correct?"