My kiddo is in size 4 Huggies. She's on the lower end of the weight range (about 20 lbs), but 3s were leaking, so we sized up a few months ago. We buy them in bulk at Costco and they've always been great, but the last batch seems to be bigger than usual (the design had changed, so maybe the structure/sizing did too?) Either way, the diapers now feel bigger than before, they go up really high on her back, and once they get wet, even a little bit, they bunch up to the side. I've tried everything - tightening them, pulling out the little liner/fringe around the legs, nothing works, especially when she's running around (which is pretty much all the time). The only thing that helps is changing her as soon as the diaper gets wet, which too is a PITA.

Any ideas or recommendations?