Understand is signed by holding your dominant hand up into a fist in front of you, then flicking your pointer finger up. This sign suggests a lightbulb turning on in your mind.
Use the understand flash card when you feel your baby is ready to grasp abstracts. We have found that this sign is best suited for babies who are about to become verbal.
Use the understand sign when you feel your toddler can grasp abstract concepts or begin to follow simple instructions.
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