sizes 0-3m, 3-6m, 6-12m .. These boots are simple, the end result is super cute and warm for baby in the colder months....if using a variegated yarn to get the look of the boots pictured. If you choose to do this, I would like to let you know that I took the extra time to measure where in the color changes I began the first boot so that the second boot would match as closely as possible. I did have to cut and rejoin the yarn a couple times to help the boots match. Of course, if you use a solid colors, this isn’t an issue.