My wife brought up some other good facts on cloth diapering. She loves the designs of them. She likes to shop around and constantly ask me if this or that pattern is cute. I think most of them are pretty cute.
I remembered that I really don't like the sound of a baby walking and crawling around in disposable plastic diapers. I'm not sure exactly why I don't like it but it probably has something to do with me spending so much time at babysitters when I was younger. To me it sounds like fingernails on a chalk board.
Sara to answer you question, we started cloth diapering Maggie around 3-4 weeks of age. The hospital gave us a bunch of diapers when we brought Maggie home. We also had a box of diapers at home just in case. We used all of those up and then shopped around for some cloth diapers. I'm not a 100% sure if you can cloth diaper from day on due to the umbilical cord being still attached. Newborn diapers have a cut in them to make room for the cord. You have to wait until it falls off to put them in regular diapers. If you have any more questions please ask, always glad to help.