I have one of those recliner things for the bath - never bothered with baby tubs, just stick the recliner (you can get a terry-cloth one from Mothercare for @£6) in the bathtub and lay baby on it, fill the tub to whatever level you are comfortable with (obviously doesn't need to be much). Once my son got to where he liked baths, I let my daughter get in with him, just for a few minutes, to splash together; she loved it and always asks to share his bath. She gets a little too excited for him so it's not an every bath thing yet, when he is bigger I'll probably let the two of them play together more often. Anyway the recliner thing is handy, esp for having the two in the bath at the same time.