I love hearing about products that other mamas have found helpful. I read about The Munchkin White Hot Inflatable Duck Tubon one of the blogs I follow Chronicles of a Babywise Mom and just had to get it for Jack. Jack's grandpa's nickname is "Duck" and who wouldn't want to take a bath in a giant rubber ducky?
In addition to being pretty darn cute, this tub is super handy. The back (tail) is high enough that I could prop Jack up when he was almost, but not quite sitting up on his own and he gets a nice deep bath without having to fill up the whole tub (saving water here). Since it's inflatable you could easily deflate it and take it with you on visits to grandma's house.
We started using this at about 5 months old but probably could have started sooner (that's just when we bought it) maybe even as a newborn. Now, at 7 1/2 old, Jack is starting to try to climb out of it so we may transition to just the tub in the next few months. Even though 2-4 months doesn't seem like that long of use for $14 it was well worth the money in my opinion. We use this almost every night and it makes bath time so much easier. Enough easier that it would almost be worth the money for just one night of use (almost). We'll keep it for (if) baby number two and I think it will be really handy for keeping big brother from knocking over little brother/sister when it comes to baths together.