The more the better, they last longer this way (LOL)

While the above is true, I usually recommend the following numbers for people wanting to use cloth either part-time or full-time.

To wash every day: (estimated number of nappies per day) x 2
To wash every other day: (estimated number of nappies per day) x 3

For full-time use:
- Newborn to about 3-4 months: at least 12 nappies per day, more if your baby wets or poos a lot
To wash every day: 12 x 2 = 24 nappies
To wash every other day: 12 x 3 = 36 nappies

- for an older baby (4-5 months to toddlerhood): at least 5-6 nappies per day, with 1-2 night-time nappies if sleeping through
To wash every day:
6 day nappies x 2 = 12 day nappies;
1 night nappy x 2 = 2 night nappies

To wash every other day:
6 day nappies x 3 =18 day nappies;
1 night nappy x 3 = 3 night nappies

For part-time use on an older baby:
- day-time: at least 4-6 nappies per day (recommend changing every 2-3 hours for good hygiene).
- night-time: 1-2 nappies per night.