Proof: Babies Can Be Jerks

Researchers already knew, thanks to previous studies, that babies, like adults, had the propensity to like babies similar to them, gravitating toward those with the same taste in food or toys. But scientists wanted to examine whether the dark side of social identification was prevalent in babies as well. Do the roots of malevolent social biases take hold in infancy?

http://www.mentalfloss.com/article/49522/proof-babies-can-be-jerks