Hi all. Still have my right arm in a sling from shoulder surgery but I'm getting restless so I thought I would try knitting some simple children's hats using my stash. I see lots of hats in finished projects here so I am pretty sure someone can tell me how many stitches to cast on for a 2 x 2 rib hat using #4 worsted weight acrylic and 5 or 5.5 mm needles. I am thinking about a size that would fit 6 to 11 year olds at the local elementary school. I can wing it from there. TIA.