4 Month Sleep Regression - Causes, Signs and How To Manage

4 Month Sleep Regression – Causes, Signs and How To Manage

Becoming a parent is an incredible journey full of many challenges and rewards, one of which is understanding and managing your baby’s sleep schedule. As new parents, it’s crucial to remember that your little one’s sleep patterns will shift several times in their first year. One such significant change is the four month sleep regression, a time of confusion and exhaustion for many parents and babies. This article will shed light on this crucial phase and provide you with insights and strategies to navigate it effectively.

What Is The 4 Month Sleep Regression?

The 4 month sleep regression is a period where your baby’s sleep patterns shift, often leading to increased night awakenings and shortened nap times. It’s a normal part of baby’s development and usually occurs when your child is around four months old. However, it can also happen a bit earlier or later, depending on the baby’s unique growth and development pace.

This period is characterized by a significant change in the baby’s sleep cycles. Until this point, your baby has been sleeping in a more newborn style sleep pattern, characterized by two sleep stages: deep sleep and REM (rapid eye movement) sleep. But around the fourth month, the baby’s sleep pattern begins to mature and becomes more similar to adult sleep cycles, involving light sleep stages and deep sleep stages.

Is It Normal?

Yes, the 4 month old sleep regression is entirely normal and a sign that your baby’s sleep patterns are maturing. It’s a crucial developmental milestone where your baby is beginning to follow a more structured sleep cycle, more akin to adults. Not every baby will experience it to the same degree, but most parents will notice some change in their baby’s sleep at around this age.

What Are the Causes of 4 Month Sleep Regression?

Several factors contribute to the 4 month sleep regression:

1. Maturing Sleep Cycles: As mentioned earlier, one of the main causes is the maturing of your baby’s sleep cycles. Babies start to move from their newborn sleep patterns to a more adult-like sleep cycle.

2. Increased Alertness: At around four months old, babies become more alert and aware of their surroundings. They’re absorbing all sorts of new information, which can interfere with their sleep.

3. Growth and Developmental Milestones: Four months is a big age for development. Babies might be rolling over, reaching for toys, and starting to babble. These exciting milestones can disrupt sleep.

4. Increased Separation Anxiety: Around this time, babies start to understand object permanence, the idea that things exist even when they can’t see them. This leads to an increased awareness that mom or dad can walk away, causing anxiety and interrupted sleep.

5. Changes in Appetite: Babies often go through growth spurts around this age, which can lead to an increase in appetite and more frequent wake-ups due to hunger.

6. Teething: Some babies may start teething around this age, causing discomfort and restless sleep.

Signs of 4 Month Sleep Regression

Parents often wonder what the 4 month sleep regression symptoms are. Here are eight signs to look out for:

1. Frequent Night Waking: Your baby might wake up more frequently at night, even after having mastered the art of sleeping longer stretches.

2. Shorter Naps: Naps may suddenly become shorter, and your baby might fight against nap time.

3. Increased Irritability: The baby may become fussier, particularly in the late afternoons and evenings.

4. Changes in Appetite: There might be changes in appetite, either an increase due to a growth spurt or a decrease due to fussiness.

5. Difficulty Falling Asleep: Even when they’re clearly tired, the baby might have trouble falling asleep.

6. More Night Feedings: Babies may start requiring additional feedings during the night.

7. Restlessness During Sleep: They may seem more restless when sleeping, moving around more than usual.

8. Increased Clinginess: Due to newfound separation anxiety, your baby might become clingier, wanting to be held more.

How Long Does 4 Month Sleep Regression Last?

Typically, the 4 month sleep regression lasts two to six weeks. It varies for each baby, depending on their unique development and how parents manage the regression period. It’s important to note that this regression is a permanent change; your baby’s sleep patterns are maturing, and their old patterns won’t return.

Does The Sleep Regression At 4 Months Affect Naps?

Absolutely, the 4 month sleep regression naps often become noticeably shorter or more challenging to initiate. Your baby may fight naptime or wake up after a short period. It’s crucial to maintain patience and continue offering regular naps to help them get through this challenging period.

How Can You Manage 4 Month Sleep Regression In Your Baby?

Here are some 4 month sleep regression tips that can serve as your sleep regression solution:

1. Create a Bedtime Routine: A predictable, calming bedtime routine can signal to your baby that it’s time to sleep.

2. Offer More Feedings During the Day: To minimize nighttime hunger, try to offer more feedings during the day.

3. Practice Patience: Remember, this phase is temporary and a normal part of your baby’s development.

4. Encourage Independent Sleep: Try to put your baby down when they’re sleepy but still awake. This helps them learn to fall asleep on their own.

5. Prioritize Good Sleep Environment: Keep the room dark, quiet, and cool. Consider using a white noise machine.

6. Stay Consistent: Try to be consistent with nap and bedtime schedules.

7. Encourage Day/Night Recognition: Expose your baby to natural light during the day and keep lights dim at night.

8. Be Responsive: If your baby cries at night, attend to them promptly. They need your comfort and assurance.

9. Seek Help: If you’re struggling, there’s no shame in asking for help. Consult a pediatrician or a sleep consultant.

When to Call A Doctor?

While the 4 month sleep regression is normal, it’s always wise to consult with your pediatrician if your baby’s sleep disturbances last longer than a few weeks, or if you notice any other concerning symptoms, such as fever, loss of appetite, or abnormal lethargy. It’s crucial to ensure there isn’t a different underlying issue causing the sleep disruption.

1. Increased Irritability or Restlessness: If your baby’s sleep regression is leading to extreme fussiness, restlessness, or irritability that lasts for several days without any signs of improvement, it may be necessary to call the doctor. These symptoms may indicate underlying health issues like ear infections or gastrointestinal problems, which need medical attention.

2. Significant Changes in Eating Habits: Noticeable changes in your baby’s eating habits, such as refusing to eat or having difficulty feeding, could be a cause for concern. It’s essential to reach out to the pediatrician if these changes persist as it might be related to illness or teething rather than sleep regression.

3. Fever or Other Signs of Illness: If your baby is experiencing a fever, persistent cough, runny nose, vomiting, diarrhea, or other signs of illness alongside the sleep disruption, you should call the doctor immediately. These symptoms could suggest that your baby is sick, and the sleep disruption is a result of this illness rather than a sleep regression.

4. Not Gaining Weight or Losing Weight: Weight gain is an essential aspect of your baby’s growth and development. If you notice that your baby is not gaining weight as expected or is losing weight during this period of sleep regression, this could signal a more serious problem and you should consult your pediatrician.

5. Extreme or Extended Sleep Regression: Typically, sleep regression phases last a few weeks. However, if the sleep regression extends beyond 4-6 weeks, it’s important to consult your doctor. Persistent sleep issues could be a sign of a more significant sleep disorder or other health issues. The doctor can offer guidance or refer you to a sleep specialist if necessary.


1. Do All Babies Have A Sleep Regression At 4 Months?

While most babies experience some change in their sleep patterns around this age, the extent of the 4 month sleep regression varies from baby to baby. Some might have a severe regression, while others may experience it more mildly.

2. How Do I Know When The Four Month Sleep Regression Is Over?

The 4 month sleep regression ends when your baby starts to settle back into a more predictable sleep pattern. They will begin sleeping longer stretches at night and their naps will become more consistent. However, remember that their sleep pattern will not revert to the way it was before the regression – this change is a permanent one, indicating the maturing of their sleep cycles.

3. Can Swaddling Help With The Sleep Regression At 4 Months?

Swaddling can indeed help some babies by creating a womb-like feeling, which can be comforting. However, remember that by the age of 4 months, many babies are starting to roll over, and it becomes unsafe to swaddle a baby who can roll. Therefore, make sure to monitor your baby’s development and adjust your strategies accordingly.

In conclusion, the four month sleep regression can be a challenging time for parents and babies alike. However, armed with knowledge and patience, parents can navigate this phase successfully, helping their baby transition smoothly into a new sleep pattern.

Also Read:

Sleep Training For Infants
Your Babies Sleeping Needs
Signs Your Newborn Is Not Getting Enough Sleep

Previous article «
Next article »
Rama is a proud Delhiite with three years of content writing experience in her pocket. She is a commerce graduate with an advanced degree in the German language, but writing feels like home to her. When she is not writing,, you can probably find her researching on environment sustainability, devouring a novel, or exploring hidden nooks for delicious food around the city.