To sign side, simply take your flat, dominant hand and slide it down a foot or two from shoulder level to hip level.
Teach your toddler the side sign when you want them to move aside to make way for sudden, heavy foot traffic in the playground, mall, or park. Teach it as well when they are posing for a photo and you want them to turn to their side for a profile shot.
Teach this sign along with the other flash cards pertaining to posing angles (photography related) or simply general instructions on where to stand or sit.
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