Bathing a newborn for the first time is intimidating for almost every new parent. The baby is small, slippery, and possibly screaming. If you are still in the first 48 hours with your newborn, the hospital staff will likely walk you through the first sponge bath. The good news: newborns do not get very dirty. They do not need daily baths, and the process is simpler than it looks once you have done it a few times.
The main question in the early weeks is whether to do a sponge bath or a tub bath. The answer is straightforward: sponge baths until the umbilical cord stump falls off, then tub baths afterward. The reason is that keeping the cord stump dry promotes faster healing and reduces infection risk. Once the stump detaches and the site heals (usually by 1-3 weeks), immersion baths are safe.
Some recent research suggests immersion baths before cord separation may not increase infection risk (Bryanton et al., 2004), but the AAP and most pediatricians still recommend sponge baths until the stump is gone. Follow your own pediatrician's guidance on timing.