https://qz.com/903871/songs-that-make-babies-happy-according-to-a-laughter-expert-grammy-award-winner-imogen-heap-and-science/?utm_source=Parent+Co.+Daily&utm_campaign=17b0ce0546-EMAIL_CAMPAIGN_2017_02_06&utm_medium=email&utm_term=0_3f341b94dd-17b0ce0546-132148897

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