To sign Christmas, form the ASL letter C sign with your dominant hand, swoop it down in front of you, then scoop it back up until your dominant forearm is upright and your 'C' hand holds steady. Imagine this sign as indicative of setting up a Christmas tree.
Teach your baby or toddler the Christmas sign in the context of setting up the holiday decor, or when you encounter the Nativity story in their picture books or cartoons, or when it is talked about in church.
This is a useful flash card taught best to toddlers in conjunction with the other holidays, religions, and traditions of other cultures.
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