We just finished giving away two of these tummy tubs, and I am sorry I didn't know about them when my son was a baby! I'm pretty sure now at 40+ lbs he's too big for it, but as a baby, I know he would have loved it. He LOVED bath time....in fact, we would give him a bath every single evening for his first couple of months, because that was the ONLY time he wouldn't cry. We'd get a good 15-20 minutes of calm and quiet while he was in the tub.
Check it out at
http://www.tummytubusa.com