Signing: You non-dominant hand should be flat with palm facing up to form a base. In your dominant hand, take your thumb and index finger together as if they are making an outline of a coin. Then run your imaginary circle along you non-dominant hand.
Usage: For children that are interested in numbers, sign count before you do any counting. As baby progresses, you can use count to prompt them to start counting. At first counting can just be like a song, with you repeating the words and performing the signs. But, as baby advances, you can use the sign to prompt them to count some small groups of things.
Flash Card: Click the link to view the Count Baby Sign Language Flash Card. The flash cards are printable and available in both U.S. Letter and A4 sizes.