A baby diaper cover is what waterproofs the diaper and prevents leaks. The cover can also help the diaper stay in place. The covers can be made out of a few different materials and can go on in two ways.
The first kind of baby diaper cover is a wrap style cover, this cover goes on just like the cloth diaper did but is held on by Velcro or snaps. These are usually a little more expensive. The other kind is the pull up style of diaper cover, but often wiggly babies can make getting them on and off a little tricky.
A baby diaper cover can be made from the easy to clean plastic or vinyl, or they can be made from wool or fleece, which allow air to flow more freely. Many parents find that five or six diaper covers is plenty sufficient and gives them plenty of options if they are looking to coordinate the cover with clothing.