Signing: The sign for yogurt looks like you are making the ASL sign for Y, dipping the Y in a tub of yogurt and then putting it in your mouth.
To sign yogurt, make your strong hand into an ASL Y (fist with pinkie and thumb extended). Make your weak hand look like it is holding a tub of yogurt by extending your finger and curling your thumb round so that it makes a horizontal C-shape. Perform the sign by dipping the pinkie from your strong hand into the imaginary tub of yogurt and then placing it to your lips.
Usage: Make the yogurt sign as you give your baby a tub of yogurt to play with.
Flash Card: Click the link to view the Yogurt Baby Sign Language Flash Card. The flash cards are printable and available in both U.S. Letter and A4 sizes.