To sign city, take both slightly curved flat hands, then have them touch at the fingertips while facing opposite directions. Switch both hands' positions while twisting them back and forth, releasing and touching the fingertips a couple of times. This is the same sign for village, community, and town.
Teach your baby or toddler the city sign when you are driving through a city or preparing to visit. Teach it as well when you encounter a city in your child's cartoons or story book.
Teach your child this sign in the context of city visits or story book mentions.