To sign front, hold your dominant hand flat, with all fingers held together and palm facing you, as you swipe it down a short distance from across your forehead till your upper chest. You are simply putting your hand in front of your face.
Teach your toddler the front sign when describing what is in front of them or you. Teach it along with similar and contrasting prepositions when your toddler is ready.
Teach your toddler this sign in conjunction with other flash cards describing location.
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