Babies Just Want to Be Smiled at

"Researchers have found that when babies smile, it's for a reason. They want whoever they’re interacting with—typically a parent—to smile back. And they time it just so, a smile here and a smile there. The researchers call it sophisticated timing. The study is in the journal PLoS ONE. [Paul Ruvolo, Daniel Messinger, Javier Movellan, Infants Time Their Smiles to Make Their Moms Smile]"