The Ferber method, or Ferberization, is a technique invented by Richard Ferber to solve infant sleep problems. It involves "sleep-training" children to self-soothe by allowing the child to cry for a predetermined amount of time at intervals before receiving external comfort.
"Cry it out"
The "Cry It Out" (CIO) approach can be traced back to the book "The Care and Feeding of Children" written by Emmett Holt in 1894. CIO is any sleep-training method which allows a baby to cry for a specified period before the parent will offer comfort. "Ferberization" is one such approach. Ferber does not advocate simply leaving a baby to cry, but rather supports giving the baby time to learn to self-soothe, by offering comfort and support from the parent at predetermined intervals. The best age to attempt Ferber's sleep training method is around 6 months-old.
Other CIO methods, such as Marc Weissbluth's extinction method,  is often mistakenly referred to as "Ferberization", though they fall outside of the guidelines Ferber recommended. "Ferberization" is referred to as graduated extinction by Weissbluth. However, despite quality long-term studies finding sleep training is not harmful some pediatricians, feel that any form of CIO is unnecessary and damaging to a baby.[unreliable medical source?]
Ferber discusses and outlines a wide range of practices to teach an infant to sleep. The term Ferberization is now popularly used to refer to the following techniques:
- Take steps to prepare the baby to sleep. This includes night-time rituals and day-time activities.
- At bedtime, leave the child in bed and leave the room.
- Return at progressively increasing intervals to comfort the baby (without picking him or her up). For example, on the first night, some scenarios call for returning first after three minutes, then after five minutes, and thereafter each ten minutes, until the baby is asleep.
- Each subsequent night, return at intervals longer than the night before. For example, the second night may call for returning first after five minutes, then after ten minutes, and thereafter each twelve minutes, until the baby is asleep.
The technique is targeted at infants as young as four months of age. A few babies are capable of sleeping through the night at three months, and some are capable of sleeping through the night at six months. Before six months of age, the baby may still need to feed during the night and all babies will require a night feeding before three months.
A study that looked at long-term consequences in children older than seven months concluded that there were no beneficial nor negative effects.  Co-sleeping is a common alternative that comes with its own risks and benefits.
In popular culture
- Robert De Niro's character in the movie Meet the Fockers tries to use the Ferber method in teaching his grandson.
- In the Modern Family episode "Up All Night", Cameron and Mitchell are seen trying to ferberize their daughter Lily. In "Catch of the Day" it is mentioned that Haley was also Ferberized.
- In the Raising Hope episode "Sleep Training", Hope's grandparents try to sleep-train her.
- In the Mad About You episode "The Conversation", Jamie convinces Paul to go one night with the Ferber method. Through the process they confront the moral and psychologic ramifications. The whole episode was done in a single take.
- In the White Collar episode "Taking Stock", Mozzie accuses Diana Berrigan's nanny Karen of being a Ferberizer.
- In the season 5, episode 4 This Is Us episode "Honestly", Jack tries to convince Rebecca that the "cry it out" method is the only way to help a restless baby Kevin sleep, as he needs to learn to soothe himself. In the same way, Kevin is shown overcoming difficult situations from his teenage and adult life on his own.
- The Care and Feeding of Children: A Catechism for the Use of Mothers and Children's Nurses (1907 edition) by Dr. Holt, L. Emmett, MD
- "Ferber Method: Step By Step Guide | Sleep Training | Baby Sleep Site". The Baby Sleep Site - Baby / Toddler Sleep Consultants. 2015-10-20. Retrieved 2021-02-10.
- Kass, Lewis J. (1 December 2006). "Sleep Problems". Pediatrics in Review. 27 (12): 455–462. doi:10.1542/pir.27-12-455. PMID 17142467.
- Price, A. M. H.; Wake, M.; Ukoumunne, O. C.; Hiscock, H. (1 October 2012). "Five-Year Follow-up of Harms and Benefits of Behavioral Infant Sleep Intervention: Randomized Trial". Pediatrics. 130 (4): 643–651. doi:10.1542/peds.2011-3467. PMID 22966034. S2CID 12739146.
- Mistaken Approaches to Night Waking Excerpt from Sweet Dreams: A pediatrician's secrets for your child's good night sleep Lowell House, 22–28 By Paul M. Fleiss, MD, MPH, FAAP, 2000
- Sears, William MD, et al., The Baby Sleep Book, Little, Brown and Company, 2005
- "Dangers of 'Crying It Out'". December 11, 2011.
- Anna Price; Melissa Wake; Obioha C Ukoumunne; Harriet Hiscock (10 September 2012). "Five-year follow-up of harms and benefits of behavioral infant sleep intervention: randomized trial". Pediatrics. 130 (4): 643–651. doi:10.1542/PEDS.2011-3467. ISSN 0031-4005. PMID 22966034. Wikidata Q34298996. National Health Service summary:
- The Ferber Method Helps Some Children Sleep Longer clinical bottom lines and summary of key evidence, 1999. University of Michigan Health System, Department of Pediatrics.