if you be do you part to save the environment as well as some cash by use cloth diaper , this be the diaper cover to own ! I use the small diaper cover from the time my son be a newborn -lrb- 7lb 9oz -rrb- until he be 7 month old -lrb- 18.5 lb -rrb- . when he be a newborn , the leg opening be a little big , however we overlap and angle the side velcro strap when fasten to minimize the gap and never have a problem with leakage . we use small size pre-fold as well as old fashion fold-them-yourself diaper which fit perfectly in the small size thirsty . we go up to the medium size thirsty when we upgrade to the large size cloth diaper . he could still fit the small thirsty if we use medium size diaper . I fully expect the medium size thirsty cover to last he till he be potty train since there be a wide range of adjustment . these thirsty be easy to clean and dry quickly on the line . they seem to be comfortable and breathable since we have never have a problem with diaper rash and my son have very sensitive skin . they also last a long time ! I receive my first Thirstie from a friend who use they for she two son . the velcro be not as strong as my new cover but strong enough to hold the cover on . we have never have a problem with leakage on that one either and this be the third baby bottom it be cover !