To make the baby sign for cold, take both hands and make them into fists with thumbs up. Pull your upper arms into your sides, stiffen your forearms, and shake your fists back and forth. Remember to also match this sign with your facial expression of discomfort. The sign looks a lot like you are shivering.
Teach your baby the sign for cold by putting their fingers on pieces of ice or in cold water and then signing while saying the word. Reinforce the sign by making it whenever you are in a situation where you are cold - like going out into a brisk night.
This is a sign that you can introduce early on to help your baby express discomfort. Because cold is a contrast sign, you may want to combine it with the flash card for hot.