Personally, I've tried everything from sound machines and black out curtains, to swaddling and sleep sacks, often falling back on the time - honored tradition of singing lullabies (and Bob Marley songs) to my babies to help them fall asleep. (romper.com)
But, the best part of Lullaby Earth mattresses are that they are the only crib mattress to offer a breathable surface with a waterproof core; this means that they are completely allergy - friendly for even the most sensitive of babies. (blog.guguguru.com)
Others play lullabies for babies, which parents can use during naptimes. (newkidscenter.com)