I typically put a flat diaper on (folded — I prefer kite folds for nights), then a PUL cover (something suitable for Fitted Diapers like this post might work), and then wool pants (I'm now in love with Humbird, but I used Disana back in the day) (simplymombailey.com)
Check out the Mini Kite fold for newborns, or the Origami Fold for babies and toddlers. (themamaknows.com)
These flat cloth diapers are ideal for smaller babies as they fold up to the perfect padfold size and into the perfect kite fold. (simplymombailey.com)