Sleep Regression in Babies: Signs, Causes & Tips for Parents 

Introduction

Sleep regression is a common stage in a baby’s development where sleep patterns suddenly change. Babies who were once sleeping well may start waking up often at night, take shorter naps, or resist bedtime. This can worry parents, but it is a normal part of growth. As babies grow, their brain and body develop quickly, which can affect their sleep routine.  

Between 6 and 15 months, many changes happen in infant sleep behaviour. Even though night waking usually reduces with age, some babies may begin waking again between 9 and 12 months after previously sleeping through the night¹. This change can be linked to separation distress, learning new motor skills like crawling or standing, or discomfort from teething².

Did you know that sleep disturbance affects about 15–35% of infants and their parents³? Parents may also lose around 2 hours of sleep per night in the early months, and about 1 hour per night from 6 to 24 months. Because of this, sleep problems are one of the most common concerns reported during routine baby check-ups². 

In this blog, let us understand what sleep regression is in a simple way, along with its signs and helpful tips for parents. 

What Is Sleep Regression?

Sleep regression is a temporary stage where a baby’s sleep pattern changes. It happens when there are changes in how babies sleep as they grow.  

Sleep is a state where the body shows reduced response to the surroundings, but the brain remains active and supports body functions. Babies move through four main sleep stages: awake, transitional sleep, active sleep with rapid eye movement, and quiet sleep, and each stage has different levels of activity⁴. 

As babies grow, these sleep stages continue to change.  

• During the first 24 months, sleep develops rapidly. Newborns do not have a fixed day and night pattern, and they sleep at different times across the day and night.  
• By around 4 to 6 months, their sleep becomes more organised, with clearer patterns of wakefulness, rapid eye movement, and non-rapid eye movement sleep. As growth continues, the time between sleep increases, and night waking and daytime naps gradually decrease⁵.
• Between 6 and 15 months, further changes in sleep behaviour occur, and some babies may begin waking again between 9 and 12 months as part of these changes¹. 

Why Does Baby Sleep Regression Happen?

Baby sleep regression happens due to several changes in a baby’s growth, behaviour, and environment. These changes can temporarily affect how a baby sleeps. 

1. Sleep Development Changes

In the first 6 months, babies gradually begin to sleep longer at night and wake less often. However, this pattern is still developing and may not remain consistent at all times. Temporary interruptions can occur during this stage. 

2. Growth Spurts and Milestones

Periods of rapid growth, learning new skills like crawling, or other developmental milestones can interrupt normal sleep patterns⁶. 

3. Separation Distress and Attachment

Babies may wake and cry when they realise their parents are not nearby. This is linked to the development of attachment during the first year. Babies who feel more distress may wake up more often at night. 

4. Motor Skill Development

Learning movements like crawling or creeping can increase night waking. These new abilities can affect how the baby settles back to sleep. Increased activity during this stage may disturb sleep. 

5. Health and Infant Factors

Minor problems such as teething, colic, or infections can lead to temporary night waking. In addition, irritability, difficult temperament, or premature birth may also affect sleep. These factors can vary between infants. 

6. Environmental and Parental Factors

Sleep environment, feeding routines, and parental responses can influence night waking. Changes in surroundings or how parents respond during the night may affect sleep patterns. Daytime sleep habits can also play a role². 

These factors may act together and differ from one baby to another. In most cases, these changes are temporary and improve as sleep patterns become more stable. 

Signs and Symptoms of Sleep Regression

Sleep regression causes changes in a baby’s sleep and behaviour. These signs are usually temporary but can be easy to notice. 

• Cries often and gets upset 
• Difficult to calm down 
• Wakes up many times at night 
• Sleep timings become irregular 
• More active and restless 
• Shows stress or discomfort 
• Feels tired during the day 

These signs can happen together during sleep regression. They usually settle as the baby adapts². 

Sleep Regression Ages

Sleep regressions are common and often linked to rapid brain development, learning new skills, teething, or changes in routines. While every baby is different, certain age ranges are typical for sleep regressions. 

1. 4-Month Sleep Regression 

• Newborn babies usually sleep 14–17 hours daily, waking every 1–3 hours. As they grow, some begin to sleep longer stretches, sometimes up to 8–9 hours¹. 
• By 3–4 months, babies may not need as frequent night feeds as in the newborn period, but many still require 1 to 3 night feedings for adequate growth and to maintain milk supply⁷. Therefore, most begin developing a more regular sleep pattern, sleeping longer at night and staying awake more during the day. However, night waking remains common. Some infants settle on their own, while others need comforting². 
• At this stage, there is a shift from newborn sleep patterns to more mature sleep cycles. Rapid brain and nervous system development can temporarily disrupt sleep, leading to frequent waking, shorter sleep, and difficulty settling seen in 4-month sleep regression. 

2. 6-Month Sleep Regression 

• Between 6 and 9 months, most babies sleep about 10–12 hours at night and around 13–14 hours in total each day^8,9. Their sleep pattern becomes more regular, with longer sleep at night. By 5–6 months, babies usually wake up less often at night^9,10.But sometimes, sleep can suddenly get disturbed again.  
• At this age, babies start learning new skills like crawling. This along with factors like growth spurts, minor illness, teething, or reaching new milestones can temporarily disturb sleep at this age^6,11. A history of colic may also contribute to ongoing night waking¹². Some infants who previously slept through the night may begin waking again between 6 and 12 months².

3. 8–10 Month Sleep Regression 

• Between 6 and 9 months of age, most infants sleep roughly 10 to 12 hours overnight. However, around 30–40% of infants still wake regularly at this age. They can often signal to their parents if they need help feeding, rocking, or other comfort to return to sleep². Even babies who previously slept through the night may start waking again. This usually happens around 8-10 months. 
• This increase in night waking is often linked to separation anxiety, learning new motor skills like crawling, or discomfort from teething. Babies who can move around, such as by crawling, tend to wake more often than those who cannot. At this stage, rapid growth in thinking, communication, attachment, and movement can temporarily disrupt sleep, causing frequent night waking. 

4. 12-Month Sleep Regression 

• By 12 months old, most babies sleep about 12–13 hours a day, with the longest stretch at night lasting around 8–9 hours⁹. Even so, about 20–30% of babies still wake up and signal for help. Babies who feel less secure may have a harder time going back to sleep compared to those who feel safe and attached². 
• While parents can usually expect longer and more stable sleep at night, every baby is different. These sleep changes happen alongside big developmental milestones: babies at this age often show more emotions, better communication, smarter thinking, and new physical skills like standing or walking with support. All these changes can affect both daytime activity and nighttime sleep, so it’s normal for sleep to still be a bit unpredictable¹³. 

5. 18-Month Sleep Regression 

• Toddlers usually sleep between 11 and 14 hours a day. By 18 months, most children take only one nap during the day, and it should not be too close to bedtime⁸.  
• Several factors can contribute to sleep regression at this stage. Toddlers may resist bedtime due to growing independence or overstimulation. Restlessness from new skills, separation anxiety, teething discomfort, changes in routines, or sleep training can all disrupt sleep. Rarely, nightmares may also occur^2,14. 
• Some children have trouble falling asleep or wake up often at night. If these issues continue, they can last for a long time. More than 80% of children who have trouble with bedtime or night waking between 15 and 48 months still experience sleep difficulties by age three¹⁵. Sleeping less than 13 hours a day can increase the chance of emotional or behavioural problems¹⁶. 
• Sleep regression usually happens at predictable sleep regression ages around 4, 6, 8 to 10, 12, and 18 months. Knowing these patterns help parents respond calmly and support their child’s healthy sleep habits. 

How Long Does Sleep Regression Last?

Babies’ sleep changes a lot as they grow. By around 6 months, many infants start sleeping longer at night, take shorter naps during the day, and begin to fall asleep on their own. Newborns, however, often have irregular sleep and may confuse day and night for the first few months. By 2–3 months, most babies develop a more predictable sleep-wake rhythm, which can be encouraged by keeping daytime light and activity distinct from nighttime rest. 

Short-term sleep disruptions can occur with developmental milestones or minor illnesses, and usually improve naturally. Certain habits, like excessive rocking or feeding at night, may extend these disruptions. Night wakings are common, but problems arise when a baby cannot resettle independently due to sleep associations or routines. Teaching self-soothing, setting gentle limits, and avoiding reinforcing night wakings helps babies and toddlers develop healthy, consistent sleep patterns¹⁴. 

Signs that your baby’s sleep is returning to normal include, falling asleep faster at bedtime, less calling out or leaving the crib, fewer and shorter night wakings, longer uninterrupted sleep stretches, and calmer bedtime behaviour. These changes show that your baby is adjusting to consistent routines and learning to self-soothe, supporting healthy and stable sleep over time⁶. 

Tips to Manage Baby Sleep Regression

Sleep changes in babies are common and often linked to routine and environment. Simple daily practices can help improve sleep patterns and reduce night waking. 

1. Follow a Consistent Routine 

Keeping regular sleep and wake times helps the baby feel secure. A fixed pattern supports natural body rhythms and better sleep. It also helps the baby recognise when it is time to rest. 

2. Create a Clear Day–Night Pattern 

Keep the room bright during the day and dim at night so that the baby knows day-night difference. Over time, it can support longer and more settled night sleep. 

3. Reduce Noise and Stimulation 

Avoid loud sounds and sudden disturbances around the baby. A calm and quiet environment helps the baby relax more easily. Soft music may also support better sleep and comfort. 

4. Use Gentle Infant Massage 

Massage is simple to learn and helps calm the baby. It can reduce crying and improve relaxation. Babies may fall asleep faster and stay asleep longer. 

Also Read: An Easy Beginner’s Guide to Baby Massage

5. Practise Skin-to-Skin Contact 

Holding the baby close improves bonding and comfort. It also helps stabilise body functions like heart rate and breathing. Babies often have fewer sleep interruptions with this method⁴. 

6. Encourage Independent Sleep Habits 

Allow the baby to fall asleep with minimal help when possible. This helps reduce repeated waking during the night. Gradual changes can support better long-term sleep habits.

7. Adjust Feeding and Nap Timing 

Spacing night feeds slowly can help improve sleep patterns. Managing nap times during the day also plays an important role. Consistency in these changes helps the baby adapt better².

Using these simple methods together can support healthier sleep in babies. With time and patience, most sleep disturbances improve naturally. 

When to Consult a Doctor?

Sleep regressions for babies are temporary and may occur due to developmental changes or minor illnesses. However, medical advice may be needed in the following situations:¹⁴ 

• Frequent night waking, cannot settle 
• Sleep issues beyond 12 months 
• Needs constant rocking or feeding 
• Poor feeding or low activity 
• Excessive crying or irritability 
• Repetitive movements (head banging, rocking) causing harm 
• Sleep issues becoming long-term (chronic) 

If sleep problems persist or worsen instead of improving by 2-3 years, medical advice may be needed to assess and manage the condition.  

Also Read: Green Poop in Babies

Conclusion

Sleep regression is a normal stage in a baby’s development, where sleep patterns temporarily change due to growth, new skills, or minor discomforts. Although it can be challenging for parents, understanding the signs and maintaining consistent routines, gentle care, and a calm environment helps babies adjust. Most sleep disturbances resolve naturally as babies develop, learn to self-soothe, and establish stable, healthy sleep habits. 

Frequently Asked Questions (FAQs)

References

1. Karraker KH, Young M. Night waking in 6-month-old infants and maternal depressive symptoms doi:10.1016  https://pmc.ncbi.nlm.nih.gov/articles/PMC2391000/

2. Karraker K. The role of intrinsic and extrinsic factors in infant night waking.doi:10.1037  https://psycnet.apa.org/fulltext/2014-52730-006.html

3. France K. Management of infant sleep disturbance: A review doi:10.1016/0272 https://www.sciencedirect.com/science/article/abs/pii/027273589390030P 

4. De Beritto TV. Newborn Sleep: Patterns, Interventions, and Outcomes. doi:10.3928  https://pubmed.ncbi.nlm.nih.gov/32045487/

5. Zanetti N, D’Souza L, Tchernegovski P, Blunden S. Parents’ perceptions of the quality of infant sleep behaviours and practices: A qualitative systematic review. doi:10.1002/icd.2369  https://onlinelibrary.wiley.com/doi/full/10.1002/icd.2369

6. Gilchrist A, Aylward BS, Laine CM, Karp H. Maturation of infant sleep during the first 6 months of life: a mini-scoping review. doi:10.3389  https://pubmed.ncbi.nlm.nih.gov/40370662/

7. Ball PH, Blair DPS. Health Professionals’ Guide To: “Caring for Your Baby at Night.” UNICEF UK; 2011. https://www.unicef.org.uk/babyfriendly/wp-content/uploads/sites/2/2011/11/Caring-for-your-Baby-at-Night-A-Health-Professionals-Guide.pdf 

8. Kaneshiro NK, Dugdale DC. Bedtime habits for infants and children: MedlinePlus Medical Encyclopedia. National Library of Medicine (US). Accessed March 20, 2026. https://medlineplus.gov/ency/article/002392.htm 

9. O’Connor C, Ventura S, Proietti J, et al. Sleep and infant development in the first year. doi:10.1038 https://www.nature.com/articles/s41390-026-04780-4

10. Mindell JA, Leichman ES, Composto J, Lee C, Bhullar B, Walters RM. Development of infant and toddler sleep patterns: real‐world data from a mobile application. doi:10.1111 https://pubmed.ncbi.nlm.nih.gov/27252030/

11. Lenehan SM, Fogarty L, O’Connor C, Mathieson S, Boylan GB. The Architecture of Early Childhood Sleep Over the First Two Years. doi:10.1007  https://pubmed.ncbi.nlm.nih.gov/36586054/

12. Weissbluth M, Davis AT, Poncher J. Night waking in 4- to 8-month-old infants. doi:10.1016  https://pubmed.ncbi.nlm.nih.gov/6707803/

13. National Center on Birth Defects and Developmental Disabilities (NCBDDD). Milestones by 1 Year | Learn the Signs. Act Early February 16, 2026. Accessed March 20, 2026. https://www.cdc.gov/act-early/milestones/1-year.html?CDC_AAref_Val=https://www.cdc.gov/ncbddd/actearly/milestones/milestones-1yr.html 

14. National Center on Birth Defects and Developmental Disabilities (NCBDDD). Milestones by 18 Months | Learn the Signs. Act Early. CDC – Centers for Disease Control and Prevention. February 16, 2026. Accessed March 20, 2026. https://www.cdc.gov/act-early/milestones/18-months.html

15. Cohen Y, Reiter J, Gileles‐Hillel A. Sleep‐related disorders in children: A narrative review. doi:10.1002 https://pubmed.ncbi.nlm.nih.gov/40625896/

16. Sivertsen B, Harvey AG, Reichborn-Kjennerud T, Torgersen L, Ystrom E, Hysing M. Later Emotional and Behavioral Problems Associated With Sleep Problems in Toddlers: A Longitudinal Study. doi:10.1001  https://jamanetwork.com/journals/jamapediatrics/fullarticle/2214166

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