What really happens when babies are left to cry it out?
What really happens when babies are left to cry it out? Some parents see "sleep training" as the key to a good night's rest. Others argue that it's distressing for babies. What do scientists say about its risks and benefits? In 2015, Wendy Hall, a paediatric sleep researcher based in Canada, studied 235 families of six- to eight-month-old babies.childreninfantsleeplink