If the Girl's and Boy's are sized the same yes L/XL will. In my experience better than adult briefs and they will work far better for bedwetting or any form where you don't/can't hold back
That'll definitely fit you. I'm around the same size but around 120-130 Lbs. I actually think the L/XL might be too big for me. I'm hoping the new separate Large that's out in a few months fits better.
I'm a guy with a 33inch waist .... and I love my Goodnights XL ...so they will most certainly fit you
While they are a bit snug, that's part of the charm.
Holding capacity is good too
Enjoy