So my alva baby diapers just came in and I went to put them on my babe and it doesn't look like they have much wiggle room? They are pockets and I only have one extra snap, after the snap I'm already on around the waist and the it's not snaped down a row. My babe is 6 months and 18 pounds. Do I have to buy bigger sizes? I cannot see these working into age 2 lol. But when I look on Amazon all they have is all in ones..hmm. Any help would be great thanks!