That baby is staring at you, and you don't know why. Something in your teeth? Did you accidentally leave a tag on your clothes? Don't worry—that baby probably just likes your face.

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Sources:
https://www.jstor.org/stable/1128785?...
http://doi.org/10.1111/j.2044-835X.19...
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http://doi.org/10.1002/9780470147658....
https://www.uni-muenster.de/imperia/m...
http://developingchild.harvard.edu/re...
https://www.ncbi.nlm.nih.gov/pubmed/1...
https://www.ncbi.nlm.nih.gov/pubmed/1...
https://www.researchgate.net/publicat...
http://doi.org/10.1111/j.1532-7078.20...
http://www.cell.com/current-biology/f...
https://www.ncbi.nlm.nih.gov/pmc/arti...