
Sleep training is a common yet controversial practice that parents use to help their babies sleep better. It involves placing the baby in a crib, soothing them, and then leaving the room, returning at designated intervals to check on the baby. While some parents swear by it, others worry that letting a baby cry will harm them. Scientific research has shown that babies who nap during the day sleep better at night, and that gentle sleep training interventions can reduce the percentage of parents reporting sleep problems. However, some research also suggests that a pattern of prolonged unattended crying can affect the wiring of a baby's brain and that sleep training can be especially challenging after 12 months of age. Ultimately, there is no one-size-fits-all approach to sleep training, and parents should consider their child's age, temperament, and consistency in their approach to sleep training.
| Characteristics | Values |
|---|---|
| Age to start sleep training | 4-6 months |
| Cry-it-out method | Controversial, may affect the "wiring" of the brain |
| Sleep training causes distress | Yes, according to 15 years of research |
| Sleep training causes scarring | No, bad sleeping habits might |
| Sleep training techniques | Night weaning, timed check-ins, gentle sleep training |
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What You'll Learn

Sleep training methods
Sleep training is a tool that can help parents teach their children to sleep independently as their sleep needs change with age and development. While some parents swear by it, others believe it is harmful to the child. Research on the topic is limited, and there is no conclusive evidence that sleep training is harmful. However, some studies suggest that a pattern of prolonged unattended crying can affect brain development.
The ideal age to begin sleep training is between four and six months, as babies are typically old enough to learn to self-soothe and may no longer require night feedings. Their sleep cycles also begin to mature, and their circadian rhythm starts to take effect. However, some babies may be ready for sleep training slightly earlier, while others might do better a little later, around the six-month mark.
Cry-It-Out (Extinction) Method
Also known as the extinction method or CIO, this technique involves putting your baby to bed when they are tired but still awake. The baby learns to fall asleep on their own without being rocked or soothed by a caregiver. While this method is popular, it is important to note that there is no "right" amount of time to let a baby cry, and parents should check in at intervals that they are comfortable with.
The Ferber Method
This is a gentler approach that allows parents to acknowledge or reassure their baby through timed interval check-ins. Parents place the baby in the crib, say goodnight, and leave the room, re-entering at designated intervals (e.g., 3, 5, and 10 minutes) to offer soothing words without picking up the baby.
Gentle Sleep Training Method
This method focuses on helping the baby learn to sleep independently without any crying. While there is limited research on this approach, it is said to produce no long-term negative mental health impact on the child or mother.
The Sleep Lady Shuffle
Created for babies and children six months and older, this method involves gentle sleep training techniques. With a pediatrician's approval, it can be started as early as 18 weeks, but it is generally recommended for babies six months and older.
It is important to remember that the best sleep training method depends on what works best for the child and the caregiver. Sleep training should be done in a safe environment, and parents should consider joining support groups or consulting a physician for guidance.
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The impact on child development
Sleep training is a common but controversial practice that parents may use to help their babies sleep by themselves. While some parents swear by it, others believe that letting a baby cry is harmful. Sleep training is often conflated with the "cry-it-out" method, but researchers are investigating gentler approaches that can help.
The impact of sleep training on child development is a highly debated topic. Some sources claim that sleep training can cause distress and negatively impact a child's emotional development. According to researchers, sleep training violates the need for safe, stable, and nurturing relationships, as well as the natural instincts of parents to comfort their children. From an evolutionary perspective, companionship care from multiple caregivers is emphasised, providing extensive affection and a constant comforting presence. As social mammals, babies need affectionate touch and soothing care as they learn self-regulation and adjust to life outside the womb.
However, others argue that sleep training does not scar a child and that bad sleeping habits may be more detrimental. They suggest that sleep training can help babies learn to self-soothe and develop healthy sleep habits. Additionally, gentle sleep training methods that involve timed check-ins and soothing techniques can reduce the percentage of parents reporting sleep problems.
The effectiveness and potential impact of sleep training may depend on various factors, including the age and temperament of the child, as well as the consistency of parenting. While some sources suggest that babies may be ready for gentle sleep training as early as 4 to 6 months, others recommend starting after 18 weeks or once they have passed certain developmental milestones.
Overall, while there are differing opinions on the impact of sleep training on child development, it is important for parents to make informed decisions and consider the potential benefits and risks of different sleep training approaches. Seeking guidance from paediatricians and experts in child development can help ensure that sleep training is approached in a safe and healthy manner.
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The impact on mental health
Sleep training is a common but controversial practice that parents use to help their babies sleep by themselves. The "cry-it-out" method, which involves letting the baby cry until they fall asleep, is one of the most well-known sleep training techniques. However, this method has been criticised as it may harm the baby's mental health.
The impact of sleep training on a 15-month-old's mental health is a complex issue that has been the subject of much debate among parents and experts. Some parents worry that letting their baby cry unattended will cause emotional damage or scar the child for life. While there is no definitive answer, research and experts suggest that a pattern of prolonged unattended crying can negatively impact a baby's mental health.
The stress response in babies can become overactive if they are not kept content most of the time, which can lead to long-term mental health issues. This is because, from an evolutionary perspective, sleep training goes against our mammalian heritage, which emphasises companionship care from multiple caregivers who provide extensive affection and a constant comforting presence. As social mammals, babies need affectionate touch and soothing care as they learn self-regulation and how to live outside the womb. If caregivers are not physically present and providing comfort, multiple systems can be affected, and the groundwork for later difficulties may be laid.
However, it is important to note that not all sleep training methods involve leaving the baby to cry unattended. Some techniques, such as the "Sleep Lady Shuffle," involve gentle sleep training approaches that can be started as early as 18 weeks. These methods focus on teaching babies to fall asleep on their own while still providing comfort and reassurance from the caregiver.
Additionally, the effectiveness of sleep training may depend on the age and temperament of the child. Some experts suggest that babies are typically ready to begin sleep training at around four months old when they are old enough to learn to self-soothe and may no longer require night feedings. However, every baby is different, and some may be ready earlier or later.
In conclusion, while there is no definitive answer to whether sleep training a 15-month-old will scar them, it is important to consider the potential impact on their mental health. Prolonged unattended crying can negatively affect a baby's stress response and lay the groundwork for future difficulties. Therefore, it is recommended to use gentle sleep training techniques that provide comfort and reassurance to the baby and to consider the baby's age and temperament when deciding on a sleep training approach.
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The ideal age for sleep training
Sleep training is a way of teaching your baby or toddler to fall asleep independently and sleep through the night. There is no universal answer to the ideal age for sleep training, as it depends on several factors, including the age, temperament, and developmental readiness of the child, as well as the comfort level and preferences of the family. However, here is a guide to help you determine the ideal age for sleep training:
Newborns to 4 months old
At this stage, formal sleep training is not recommended as newborns are still learning to differentiate between night and day, and they are not expected to navigate night wakings on their own. Instead, parents can focus on setting a foundation for healthy sleep by establishing a sleep schedule, learning their baby's cues, and creating a soothing sleep environment.
5 months old and above
Around the 5-month mark, babies typically go through a developmental progression, and their sleep cycles start to resemble more adult-like sleep stages. This is when many babies may be developmentally ready for sleep training. Melatonin, the body's natural sleepy hormone, also begins to regulate at this age, making sleep training more effective.
6 months old and older
At 6 months and beyond, babies are generally considered more developmentally capable of falling asleep independently. The "Ferber Method," also known as the "cry-it-out" method, is often recommended for children in this age group. However, it is important to ensure that all of the child's needs have been met before leaving them to self-soothe, and gentle sleep-shaping techniques are generally recommended for this age group.
9 to 12 months old
Sleep training can become more challenging during this stage as infants start to understand object permanence and may become more clingy. They are also reaching significant physical milestones, such as standing, crawling, and walking, which can impact their sleep. However, it is still possible to sleep train during this period with consistent and gentle approaches.
Toddlerhood (12 months to 3 years)
Sleep training can still be effective during toddlerhood, but it may require different strategies as toddlers experience increased independence and another wave of separation anxiety. Gentle methods, such as gradual withdrawal or interval-based reassurance, can be more suitable during this stage.
In conclusion, while there is no one-size-fits-all answer to the ideal age for sleep training, it is generally recommended to wait until your baby is at least 5 months old, with 6 months and older being a more ideal timeframe. However, the right" time for sleep training is ultimately when you and your family feel ready, taking into account the unique developmental milestones and temperament of your child.
Regarding the concern of scarring a 15-month-old through sleep training, it is important to note that while some research suggests that prolonged unattended crying can affect brain development, the act of crying itself is a form of communication and does not inherently cause emotional damage. Additionally, the effectiveness of sleep training varies, and it may not always lead to long-term results, so it should be approached with flexibility and adapted to the needs of the child and family.
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The impact on parent-child relationships
The impact of sleep training on parent-child relationships is a highly debated topic, with some parents swearing by it and others believing it is harmful. Sleep training is often encouraged by authors, bloggers, and some doctors, who claim it helps a baby learn to self-soothe and calm themselves. However, researchers in early childhood development argue that sleep training violates the need for a safe, stable, and nurturing relationship with caregivers. They emphasize that from an evolutionary perspective, human infants require companionship and care from multiple responsive caregivers, including affectionate touch and soothing care, as they learn self-regulation and adjust to life outside the womb.
The controversy surrounding sleep training primarily revolves around the "cry-it-out" method, which involves letting the baby cry for a period of time before being soothed or attended to. Some parents find it challenging to hear their child cry and fear that it may cause emotional damage or scarring. While there is no definitive evidence that a little bit of crying will harm a child's psyche or prevent secure attachment formation, research suggests that a pattern of prolonged unattended crying can affect the "wiring" of the brain. This is because the stress response can become overactive if babies are not kept content most of the time, potentially leading to long-term physical and mental health issues.
However, it is important to note that not all sleep training methods involve leaving the baby to cry unattended. Gentle sleep training approaches, such as the Sleep Lady Shuffle, emphasize the presence and reassurance of the parent while gradually teaching the baby to fall asleep independently. These methods aim to reduce the stress and crying associated with sleep training by providing a supportive environment for the child.
The effectiveness and potential impact of sleep training on parent-child relationships may also depend on the age of the child. Some experts suggest that babies are typically ready to begin sleep training around four to six months of age, as this is when they may be developmentally capable of self-soothing and their sleep cycles start to mature. Starting sleep training earlier than four months may not be advisable, as newborns have short sleep cycles and rely on frequent feedings throughout the night. On the other hand, sleep training after twelve months can become more challenging due to the child's increasing milestones and growing independence.
In conclusion, the impact of sleep training on parent-child relationships is a complex and multifaceted issue. While some parents find success and relief through sleep training, it is crucial to approach it with caution and consider the age and temperament of the child. Gentle sleep training methods that prioritize the parent's presence and emotional responsiveness may help reduce potential negative impacts on the parent-child relationship.
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