This pattern offers sizes ranging from preemie through XL.  Preemie will fit the tiniest of newborns, while XL will take you through potty training.

Description From the LTK Website:

The Ribby Wrap combines the best of all worlds-a knitted wool for breathability and natural wetness protection, coupled with the ease of a wrap. No pulling pants off a squirmy toddler, our Ribby Wrap has simple button closures, with multiple settings for a customized fit. With ribbed crotch, our wrap offers the most trim fit you can get without compromising the wetness protection. In addition, the rib allows the soaker wrap to fit longer, as it will grow with your child. But best of all, the ribby wrap has unique gussets that will hold any mess your child can make. It’s the ultimate in wetness protection!

With detailed instructions and an appendix chock full of techniques, this pattern is unlike any other. Super fast to knit, you can have a Ribby Wrap done in just a few short hours! With sizes from newborn through extra large, this pattern will get you through all the diapering years.“