The number of diapers you will need depends on a few variables, like the age of your baby, how heavy a wetter your baby is, and how frequently you want to do laundry.
For a newborn you might consider having 12-15 diapers if you plan to do laundry every day. If you’d prefer to do your diaper laundry every other day, consider starting out with 24-36 diapers.
For infants 3 months and older, 10 – 12 diapers might be a good start, 20-30 if you want to do laundry less often.
One great thing about Lovely Pocket Diapers is that they can be adjusted using the snaps so the same diaper will fit from newborn through potty training for most babies and children. To make them even smaller, try this: http://fluffbumbabies.com/2014/01/06/make-os-diaper-newborn-size/