You would only need your two fingers, and you would firmly press down on your jugular, right below the base of your thumb, and on the inside of your elbow.
An 18 month old baby and experiencing the world through senses is in Piaget's sensorimotor stage. The sensorimotor stage is the development of our senses such as, sense of sight, hearing, feeling, tasting and smelling. The sensorimotor stage is developed through 18 to 24 months of age.