I would try bikini twist or add a doubler when trifolding before sizing up. Unless you get premiums (4x8x4), the increase in absorbency from the couple inches on the edges in the next size isn't going to do much. My DD (17mos) can pee straight through a premium in angel fold but not bikini twist or trifolded.
Wife to my best friend
DD1 (4/15/10) and