I made my great-nephew, Muffin Man, two skater beanies. I used the usual free pattern http://chiescrochetandknitting.blogspot.com/2005/11/very-simple-skateboarder-beanie.html but since he's only 6 months old, I stopped at row 11 when increasing and then went straight to row 18. His mom measured his head for me and it is around 17 inches in circumference, so this may be a bit big. I measured it as I went, but you never know how things will turn out sometime. I used Caron's Simply Soft yarn and a G hook.