Singing to babies comes naturally for many parents.

And now, a new study from Yale University finds that singing to babies lifts their moods and improves their overall well-being.

"Infants who are being sung to a lot are happier in general throughout the day, not just when singing is happening," said Samuel Mehr, an associate professor adjunct at the Yale University Child Study Center and one of the authors of the study.

He and his team looked at 110 parents and their babies, most of them under fourth months old.

"We send very, very quick surveys to parents by text message, and we do that at random intervals each day. And the surveys are really, really quick and easy to answer accurately," said Mehr. "There are things like in the last two or 3 hours, did your baby cry? You know, in the

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