Leaking help!

I just got some pre loved cloth diapers and they are leaking every single time. Usually around the legs. Today it leaked so much the outside was wet as well. I haven't stripped them yet, just washed them several times. I can't ever seem to get them super tight around her legs but it doesn't seem loose either. Any suggestions on how to fix it would be great! I hate for my husband to be right and cloth diapers not work.