For the first few weeks, babies get sponge baths. Then, after the umbilical cord stump falls off and the circumcision heals (if your baby was circumcised), babies can have baths in a sink or small plastic infant tub.
When your baby is ready for tub baths, the first ones should be gentle and brief. If your baby gets upset, go back to sponge baths for a week or two, then try the tub bath again. A bath two or three times a week in the first year is fine. More frequent bathing may be drying to the baby’s skin.