The letter Q is signed like G, but the former is held upside down.
The letter Q is signed by holding down your dominant hand, palm facing in, with your with knuckles lined up horizontally. Keep your middle, ring, and pinkie fingers curled in, while your index finger and thumb stick out parallel to each other, like two legs of a person standing up.
Teach your toddler the letter Q sign when it is necessary to finger-spell some simple words - or the initials of objects, places, animals, or people's names. That way, your toddler slowly begins to associate the sign with the sound of the letter in a word or name.
This is a useful flash card taught best in conjunction with the other letters of the alphabet.