How long to let baby cry it out 1 year

        1. Sleep training how long is too long

          2. How long is too long to cry it out!

          What really happens when babies are left to cry it out?

          Amanda Ruggeri

          Features correspondent

          Alamy

          Some parents see "sleep training" as the key to a good night's rest.

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        4. How long is too long to cry it out
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          7. 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.

          The purpose: to see if sleep training worked.

          By its broadest definition, sleep training can refer to any strategy used by parents to encourage their babies to sleep at night – which can be as simple as implementing a nighttime routine or knowing how to read an infant's tiredness cues.

          Tips like these were an important part of Hall's intervention.

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          So was a strategy that has become commonly associated with "sleep training" and t