DD will be 5 weeks tomorrow and was 8 lbs 4 oz at her checkup last week. We had her in NB size diapers for about a month, and Pampers Swaddlers were our favorite out of everything we tried (Huggies, Honest Co, Seventh Gen). We moved her up to size 1 about a week ago when the NBs started getting too tight. We had a couple diaper blowouts with the NB size, but now with size 1 she seems to be leaking out the leg almost every day. At first I was putting the diaper on super tight, but I read that that might be the culprit , so I stopped. I'm also making sure that the cuffs are out like the Pampers site says. However, when she kicks I can still see a gap between her and the diaper.