If you have kids under 5 this is great

[Lumpy]

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Why do you say that?

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Kids learn to speak because it's the only way they have to communicate with people around them.
But if they can communicate another, easier, way, they'll do that. Hence, less speaking, which delays verbal development.


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I disagree. We used sign language with both of our children as infants. Our oldest was putting together 4 and 5 word sentences by about 16 months.