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Research shows that young children are attracted to “parentese” or “motherese” — the kind of “baby talk” that the videos predominantly feature, in which the voice gets higher and facial expressions are exaggerated, Dr. Moyle said.

“It makes sense that dolphins would use their version of motherese almost solely for bonding,” she says, given their large, mobile societies, and the necessity of staying in touch over sometimes long distances.

Mother bats speak to their babies in an equivalent of “motherese.”

And babies, as anyone who has ever found themselves in the presence of one knows, also prefer the higher pitched, universal singsong that researchers call "motherese."

It's the exaggerated pitch, tempo and intonation that parents use when talking to their little ones — what linguists call "motherese" or "parentese."