Experts say the "cry it out" method does not cause Baby any harm if parents are consistent. 

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baby crying it out when to start sleep training
Credit: joffi/Pixabay

Sleep-training techniques that fall under the controversial "cry-it-out" method are actually effective and do not cause psychological harm if conducted in a controlled, consistent way, a new study published in the journal Pediatrics has found.  Time.com has more: