I tried using the search function but didn't find anything about this. My question is when do you decide to go up to the next size in prefolds? Is it by weight, or absorbency or something? I'm not sure which brand of prefolds we have (we bought them second-hand) but we have a small size (they have blue stitching on them if that helps) and a large size (no colored stitching). L is currently wearing the small size jelly-rolled with a snappi during the day and she is probably approaching the 14lbs. mark (I will know for sure how big she is at her appt. on Monday.). Sorry I can't be more clear about details, but any advice you guys have would be great. Thanks!