If you’re the parent of a new baby, you’ve experienced the long nights when your baby will wake at the slightest disturbance—a door closing, your dog barking, or merely the creaking of the house.

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“The sound machine can generate any of several types of sound, from nature [or] music,” Dr. Cory Portnuff, an audiologist at the University of Colorado Health’s Hearing and Balance Clinic, says. In ...