I just finished crocheting this baby hat using Plymouth Encore yarn and a size F hook. I followed the pattern, and it ended up being a baby hat. If I decide to make it again I will use a size G hook, chain more stitches, and crochet more rows.
Its an interesting pattern, because it is a crochet ribbed hat. It is crochet flat, single crochet through the back loops (for ribbing), then it is turned into a hat.