See how a smile grows from that first gassy grin into a sense of humor.

Babies’ smiles are so powerful, we make a mental rolodex of them to shore us up on lousy days. We feed off them.  Get fat on them. And it’s simply because there is no smile on earth that is more genuine or pure.

But a baby’s smile is more than an emotionally gratifying gesture. It is the start of a developmental journey that begins from an innate, involuntary act and transforms into a complex social expression of joy and desire in the course of a baby’s first year.

Here is the amazing step-by-step look at how this sweetest of milestones unfolds.

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