Oh! I should have said where they came from.
Originally they’re out of Stich 'N Bitch, but I found a link here on knittinghelp to where the pattern has been put online.
Here it is to make it easier for you: http://kittyville.com/knit/kitty_hat.html
I don’t think she has it posted for a child’s size, but it’s a pretty basic hat base with just seed stitch and garter stitch. It should be easy enough to decrease the number of stitches by a certain percent for the hat and earflaps, though I think I might even leave the ears the size they are in the adult pattern.
Be warned for the kitty ears though: When I tried to place them where the pattern says, they looked too far back. I had to put them even an extra half inch or so in front of the center line (the PATTERN says 3/4 inch in front of the center line, but I did them about 1.25 inches foreward of center) and angle them pretty far to point the bottom corner at the earflap.
My suggestion is to use a DP needle, and just poke it down through the hat where you expect to pick up the first stitch for the kitty ear, and back up through the hat where you expect to pick up the last. Do the same on the other side, and then you can put the hat on and the two DPs sticking out will show you where the base of the ear will end up and how it will be angled when the hat is on. Then you can move it around till it’s right without having to rip stitches out and try over.