Side to Side Stripes by the Universal Design team calls for Uptown Worsted and Uptown Worsted Spirit Stripes. It's available from 3 mos to 10 years!
Sizes 3 mo (6 mo, 12 mo, 24 mo, 4 yr, 6 yr, 8 yr, 10 yr)
It's knit using size US 9 needles.
This pattern is available as a PDF download.