The gauge for the baby knit sizing is 24sts/ 36rows = 4x4in/ 10x10 cm
Crochet: 32sts/ 32rows (20sts/ 20rows) = 4x4 in/ 10x10cm in single crochet with size B/ 2.25mm (G/ 4.0mm) hook.

This pattern contains knit and crochet elements. The hat is knit, but the ears are crochet.

Skills needed to complete the hat.
Knitting: Knit, Purl, Knitting in the round, Decreasing, Changing color, Seed stitch, Loop stitch (which is described in the pattern).
Crochet: Chain stitch, Single crochet, Single crochet increase, Single crochet decrease.