http://www.wsj.com/articles/what-your-babys-smile-can-tell-you-about-her-development-1448303794
What Your Baby’s Smile Can Tell You About Her Development
Infants’ earliest grins are a primitive impulse but become a communication tool; know the types of baby smiles
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What Your Baby’s Smile Can Tell You About Her Development
What Your Baby’s Smile Can Tell You About Her Development
