My LO is almost 2 moths and weighs close to 15 lbs. It's starting to get hard to get the prefold snappied now so I am starting to use our OS diapers. At 15 lbs I didn't think I'd have to worry about them fitting, but I am getting leaks in a lot of them. BG , TotsBots, and RaR fit with no problem, I have a hard time getting the FB to fit. Blueberries sometimes leak, Swadlebees gape really bad around the leg, and Kawaii and Oh Katy leak a lot. The inserts aren't saturated--they are just leaking out the leg. What am I doing wrong?