They generally do not need real baths unless they have gotten especially dirty or if they need baths for fleas. (angelsonwheels.org)
Tub Bathing: When your baby graduates from sponge baths to real baths there are a number of options for tubs. (health-foundations.com)
I'll add a baby bath to the list (we have a tiny bathroom, so it had no where to go and what's wrong with an actual real bath anyway! (hurrahforgin.com)