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Parents swear by this surprising sleep trick for babies—but does it actually work?
The so-called butter sleep hack reportedly began with U.S. parents before making its way to the UK and New Zealand.
Butter Before Bed? Here's What Experts Say About This Sleep 'Trend' for Infants and Toddlers (Exclusive)
Dr. Rebecca Greenberg Carter with the University of Maryland Medical System and Brittany Sheehan, pediatric sleep consultant ...