Sing

To make the baby sign for sing, take your slightly curved open hand, hold it close to the top of your chest, then move it outward and upward at an angle, as if indicating the air that is carrying the sound waves generated by your singing.

Alternatively, you can make the sign for music, so take your non-dominant hand and hold it out across your body. Then take your dominant hand and wave it back and forth across your non-dominant forearm, as if you are conducting a choir.