Just in case you wanted to know...
Yarn: Malabrigo worsted weight yarn in Melilla (226)
Needles: DPN size US 10 1/2
Size: Ages 2-5, just adjust the length to fit.
Cast on 21 stitches. Knit in the round until they are 3 1/2 inches long (or measure your own little one for thumb placement.) Cast off three stitches. Continue the row. Next row cast on three stitches and continue knitting for 3 rows or until they are the desired length. Use a stretchy bind off (I use this method.) Done!