This is a cool pattern. The pattern website is actually in Danish, so if you can't read Danish you can use a pattern of the right size for your little guy and use the pattern that you see in the picture.
ABC Knitting Patterns - Little Boy's Cuff-to-Cuff Sweater
This sweater turns out so darling! Is from Ravelry: Provence Cabled Pullover pattern by Classic Elite Yarns