Ambulance is signed by taking a half-open 'C'-shaped dominant hand and rotating it above your head. The motion should look like the rotating lights on top of an ambulance. An alternative sign for ambulance is to take both hands in a half-open 'C' shape and rotate them above the head.
Ambulance and other vehicle signs are particularly popular among boys. Introduce the sign using toys, books, videos, and any real-life sightings you have with your baby. Animate the ambulance baby sign by making the siren sound to capture your baby's attention and make the sign memorable.
Introduce the sign for ambulance once your baby or toddler has mastered the sign for car and has started to show interest in a variety of modes of transportation. Another context is when you have a chronically ill baby or toddler, and you need signs to express medically related objects that are part of their routines.