About 2-3 dozens prefolds / traditional cloth nappies
4-6 diaper covers. If breastfed with explosive poo, then need more covers.
liners: washable or disposable ones, to keep skin dry
Read more at How to Successfully Cloth-Diaper a Newborn Baby | Mummy's Reviews
From 2-3 months old, breastfed baby usually poos less, and also fit better into Small or One Size modern cloth diapers.