Teach your baby the sign for the word comb in baby sign language with the following description and video.
Form one hand into a claw. Hold the hand to the side of the head. Move the hand backwards in a motion that mimics combing the hair.
Acredolo, Linda & Susan Goodwyn. 2009. Baby signs: How to talk with your baby before your baby can talk, 3rd edn. New York: McGraw Hill.