I can't seem to find shorts for summer for my hefty 5 month old. He weighs >18 lbs, but, while long, his length is all in his torso. He also wears cloth diapers. So he's got a big waist, thighs, and butt, but short (average for his age?) legs. All the shorts I've tried are either too tight or too long.

I want to try Zara since shipping and return shipping is free (right?). But I thought I'd ask here first if you think their stuff is cut well for my babe? Basically, I need a cut that's short and wide

If you have other brands you think would work well, please let me know!