12th Month Sleep Regression: Signs, Causes, And Tips To Handle

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The exact cause of the 12-month sleep regression in babies is unknown. Most babies have frequent, unexplained sleep disruptions, called sleep regressions. Usually, the sleep regressions coincide with major brain developments. 12-month-old babies usually achieve or are on the verge of achieving milestones such as fine motor skills, including holding their toys, and gross motor skills, such as sitting up without support.

Many 12-month-old babies who previously used to sleep well may struggle to fall asleep or wake up in the middle of sleep during a sleep regression. In addition, parents may struggle to manage sleep regression since they have already gotten used to a little one who sleeps through the night. However, it is a temporary phase, and the baby eventually returns to normal sleep patterns.

Read on to know more about the causes and tips to manage 12-month sleep regression in babies.

What Is 12-Month Sleep Regression?

The 12-month sleep regression is defined as an event when the baby displays a regressive trend in their nighttime sleep routine at or around the age of 12 months (1). Most babies sleep through the night as they grow older and could have 11 hours of nighttime sleep by 12 months (2). However, around or after the baby’s first birthday, parents may notice that the child wakes up frequently from sleep and struggles to fall asleep at bedtime. The baby may also grow restless when placed on the bed for sleep. These events are indicative of sleep regression.

Sleep regression occurs at multiple ages during infancy and toddlerhood, such as at the ages of four months, six months, and eight months. No exact time range or duration can be predicted for sleep regression in a baby.

How Long Does 12-Month Sleep Regression Last?

Sleep regression is a temporary. In most babies, the 12-month sleep regression subsides in two weeks. Sleep regression may depend on several factors, such as the baby’s sleep environment. Therefore, depending on the factors, sleep regression may last up to six weeks in some babies (3). If 12-month sleep regression extends beyond six weeks, consult a pediatrician.

What Causes 12-month Sleep Regression?

The 12-month sleep regression is likely the result of the rapid growth and development that babies display at the age of 12 months. A 12-month-old will develop several essential skills, such as walking with support and saying simple words (4). The multiple changes in the body may affect body functions, including sleep.

The following are the various 12-month developmental milestones that may lead to sleep regression (5) (6) (7).

  1. Walking: Babies display high mobility around or after their first birthday. They pull to stand and walk with support. The newfound excitement to explore may cause sleep disturbances.
  1. Talking: A 12-month-old can say simple words and can respond to questions. You may observe them babbling, yelling, and even uttering small words or sentences, and these activities may carry on even during bedtime.
  1. Separation anxiety: A baby at 12 months is likely to display emotional attributes, such as nervousness around strangers and anxiety when parents leave. Separation anxiety peaks between the ages of 10 and 18 months. It may make it difficult for the baby to fall asleep when a parent is not in their line of sight. A 12-month-old who wakes up at night may not fall asleep again unless comforted by a parent.
  1. Change in daytime naps: By the age of 12 months, babies usually nap less frequently during the day. A 12-month-old is likely to nap for three hours during the day. The change in the total hours of daytime sleep may influence the nighttime sleep, causing the baby to develop sleep regression.
  1. Teething: The teething phase is marked by sore and inflamed gums. It can cause the baby to become irritable and also disrupt their sleep.

What Are The Signs Of 12-month Sleep Regression?

The signs of 12-month sleep regression may vary among babies. The following are the common signs of sleep regression that parents may observe in their 12-month-old (1).

  • Difficulty in falling asleep at bedtime.It is the most common sign of sleep regression. Babies may find it difficult to fall asleep and appear excited or energetic instead of calming down before bedtime. Some babies may cry and throw a tantrum if repeatedly coaxed by the parents to sleep.
  • Fussiness after waking up at night. The awakened baby would find it difficult to fall asleep and would act fussy. They may also display clinginess and would only sleep when held by a parent.
  • Longer daytime naps. Sleep regression may cause the baby to become sleep deprived, causing them to have longer daytime naps. Too much sleep during the day may make it difficult to sleep at night, thus causing a repeated sleep regression cycle. 

Tips To Manage 12-month Sleep Regression

You may try the following tips to manage sleep regression and help your baby sleep better (8) (9).

  • Track your baby’s sleep patterns. Parents should keep a log of their baby’s sleeping schedule, including daytime naps. Any changes in the sleep patterns can help identify the triggers and let you tackle them before the onset of sleep regression.
  • Keep them active during the day. Parents should engage their babies in more daytime activities. These activities should be mentally and physically stimulating for the baby, so they can tire themselves to sleep at night.
  • Maintain a fixed sleep routine. Place the baby to bed at the same time each night. Also, maintain fixed timings for daytime naps. It will help prepare the baby’s body for sleep. You may also observe a nighttime practice, such as a bath or reading a book, which can signal the baby that it is time to sleep.
  • Avoid sudden changes in sleep routine. Once you establish a sleep routine for your baby, avoid making changes to it. If you expect disruption in your baby’s sleep patterns due to an activity, such as traveling, plan your baby’s daytime and nighttime sleep timings beforehand.
  • Feed your baby adequately. Make sure the baby is sufficiently fed during the daytime to avoid any late-night hunger pangs.
  • Manage separation anxiety. Comfort your baby to sleep in their crib and leave the room only when they have fallen asleep. If the baby develops sleep regression before the age of 12 months, you can consider room sharing up to the baby’s first birthday. Placing the baby’s crib in the same room as the parents can help them fall asleep sooner after nighttime awakenings.
  • Try soothing methods. Place a night lamp in the baby’s room so that they do feel scared and anxious due to darkness during nighttime awakenings. You can place their favorite toy away from the baby’s bed but within their line of sight. You may also offer the baby a pacifier to calm them down to sleep.
  • Teach the baby to self-soothe. There are several ways to teach your baby to self-soothe. The controlled crying method is one such method. Crying it out or the Ferber method has declined in popularity as concerns have been raised both about its efficacy as well as it’s long term effect on the child’s mental health.

During nighttime awakenings, avoid picking up the baby to soothe them.Instead it might be a better idea to comfort them while they remain in the crib.

Remember as far as sleep training is concerned, there is no correct way to do it – all babies are different and so are the circumstances in which they are growing up. Be patient. Be consistent. Train in a manner which is comfortable for you as well as the baby. It might seem difficult but it will eventually bring lasting results.

When To See A Doctor?

Sleep regression is a temporary event and seldom causes any adverse effects. Nevertheless, consult a pediatrician if the baby displays the following conditions.

  • Sleep regression for more than six weeks
  • Lack of growth
  • Lack of weight gain or sudden weight loss
  • Abnormal breathing or snoring during sleep
  • Significant changes in feeding and toilet habits
  • Significant behavioral changes
  • Loss of achieved developmental milestones

Frequently Asked Questions

1. Does sleep regression affect all babies?

Not all babies experience the 12-month sleep regression after their first year. Each baby adapts to a sleeping pattern as they reach their first year of life (10).

2. Is it alright to let the baby cry during sleep regression?

While it is difficult to see your baby cry, waiting a few minutes before trying to soothe them during a sleep regression is recommended. This delay in calming them could teach your baby to self-soothe and might make them fall asleep by themselves (10).

The 12-month sleep regression may come across as a tough time for parents. Thankfully, it is a temporary event. Sleep regression often occurs at a younger age, as well. Thus, many parents are likely to have experienced the event before and may know ways to manage it. Nevertheless, being patient and giving yourself and your baby extra care can help you wade through the 12-month sleep regression.

Infographic: Is Your Baby Sleeping Okay?

At 12 months old, it is natural for babies to experience interrupted sleep due to different changes in their bodies and developmental milestones. From the above information, it is clear that sleep regression is common and temporary. But amidst waking up and falling back to sleep, how do you ensure that your baby is getting enough sleep? This infographic will help you with that. Save it for your reference to understand the appropriate sleep patterns of a 12-month-old baby.

12 months old baby sleep pattern [infographic]
Illustration: MomJunction Design Team

Key Pointers

  • The 12-month sleep regression is when the baby wakes up frequently from sleep and struggles to fall asleep at bedtime.
  • Sleep regression is temporary, and in most babies, it subsides in two weeks.
  • The 12-month sleep regression is likely the result of the rapid growth and development in babies at 12 months.
  • The signs include difficulty falling asleep at bedtime, fussiness after waking up at night, and
    longer daytime naps.


MomJunction's articles are written after analyzing the research works of expert authors and institutions. Our references consist of resources established by authorities in their respective fields. You can learn more about the authenticity of the information we present in our editorial policy.
1. 12-Month Sleep Regression;Sleep Foundation
2. Infant Sleep; Stanford Children’s Health
3. Christina Stolfo,Sleep Training; Northwell Health
4. Important Milestones: Your Child By One Year; Centers for Disease Control and Prevention
5. Macall Gordon, From Safe Sleep to Healthy Sleep; University of Washington
6. Separation Anxiety; Stanford Children’s Health
7. Your Infant is Teething; Children’s Hospital Los Angeles
8. How to Keep Your Sleeping Baby Safe; American Academy of Pediatrics
9. Pacifiers: Satisfying Your Baby’s Needs; American Academy of Pediatrics
10. 12-month Infant Sleep Regression; Sleep Foundation
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Swati Patwal

Swati Patwal is a clinical nutritionist, a Certified Diabetes Educator (CDE) and a toddler mom with over eight years of experience in diverse fields of nutrition. She started her career as a CSR project coordinator for a healthy eating and active lifestyle project catering to school children. Then she worked as a nutrition faculty and clinical nutrition coach in different... more

Dr. Pooja Parikh

Dr. Pooja Parikh is a pediatrician whose medical journey has taken her from Rajkot (PDUMC) to Vadodara (SSGH) to Mumbai (Hinduja & Breachcandy Hospital). Currently she is actively involved in critical, intensive and general care of 0 to 18-year-olds in the port town of Gandhidham, where she was born and brought up. She believes that a doctor should be involved... more