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Understanding the 4-month sleep regression:

Writer's picture: Sophia MasurSophia Masur

As a sleep consultant, one of the most common concerns I hear from parents is about the 4-month sleep regression. While challenging, this developmental phase is completely normal and can be navigated with patience and strategies grounded in science and consistency.

baby boy experiencing the 4 month sleep regression after a bath.
During the 4 month sleep regression a bath before bed is an important part of the routine.

What is the 4-month sleep regression?

The 4-month sleep regression occurs anywhere from 13 weeks of age to 16 weeks of age, marking a significant milestone in your baby’s sleep development. During this time, babies undergo major changes in their sleep cycles. Prior to this stage, infants experience sleep in a simpler pattern—largely in deep, undifferentiated sleep. However, by 4 months, babies begin to cycle between light and deep sleep, similar to adults. This shift can lead to more frequent nighttime wakings and disrupted day time sleep.


The science behind it

Research indicates that at 4 months, babies' sleep architecture starts to mature. Babies start experiencing REM (Rapid Eye Movement) sleep more frequently, which is lighter and more easily disrupted compared to the deep sleep they experienced in their first few months. This is a necessary development, but it can cause difficulty for both parents and babies, as the baby is now more likely to wake up during the night, needing help to get back to sleep.


What can parents do?

  1. Establish a consistent routine: Sleep training methods like consistent bedtime routines are crucial at this stage. Studies show that consistency helps babies feel secure and manage the changes in their sleep cycle more easily.

  2. Create a sleep-friendly environment: The sleep environment matters, a-lot! Make sure the room is dark, quiet, and at an optimal temperature. White noise can help soothe your baby through the lighter stages of sleep.

  3. Self-soothing techniques: Encourage your baby to learn self-soothing skills, such as sucking on their hands or sucking a dummy/ pacifier. Research supports that allowing babies to develop these skills can lead to longer, more independent sleep.

  4. Stay patient: The 4-month sleep regression unfortunately doesn't go away, which means parents need to approach this regression with consistency to see positive change in their babies sleep. Teaching your baby how to sleep and stay asleep is your key to success here!




Remember, support is available and I am here to help if you need it. Don't suffer through the 4 month sleep regression alone, especially if you aren't coping.


Sophia xx

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