Some styles of diapers need to be "prepped" before they become absorbent enough to use for cloth diapering. For the most part, natural fiber cloth diapers do need to be prepped before use. Natural fibers contain oils which repel liquid. It takes a few washes before the oils are released from the fibers, and the fabric becomes absorbent enough for use in diapering. If you're uncertain if your cloth diapers need to be prepped before use, you can look at the fabric list and instructions here.
|This unbleached cotton prefold from Cotton Babies was very linty, but I had almost no lint while prepping OsoCozy Prefolds.|