Teach your baby the signs for the words happy and sad in baby sign language with the following descriptions and videos.
Hold the hand in front of the chest with the palm facing the body. Sweep the hand up twice in a circling motion. The face should express happiness.
Hold the hands in front of the eyes with the palms facing the body. Lower the hands in the motion of tracing tears falling from the eyes. The face should express sadness.
Acredolo, Linda & Susan Goodwyn. 2009. Baby signs: How to talk with your baby before your baby can talk, 3rd edn. New York: McGraw Hill.