With DD, we used a service, so we just waited until her umbilical cord stump fell off - around 1 week.
With DS, we used sposies until he was about 9 months
I was still using the service with DD, which was only prefolds and couldn't fathom the thought of having to hand wash poopy covers several times a day. At 9 months our lives calmed down a bit and I bought a stash of fitted diapers and haven't looked back.
We now use only cloth - night time, outings, trips, everything! Love it!