BABY
Don't Get Blindsided by the 3- to 4-Month Sleep Regression
Sleep regressions confound and frustrate so many parents. But, you don't have to be one of them.

Written by
Dr. Harvey Karp

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BABY

Written by
Dr. Harvey Karp

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The 3- to 4-month sleep regression confounds and frustrates so many parents. But with these preventative tips, you don’t have to be one of them!
There’s a point in every parent’s journey when your little baby starts to sleep better...and you’re so relieved and so happy. But then…a bump in the road! Seemingly overnight your 3- or 4-month-old baby’s sleep patterns change for the worse. Why? When babies reach between 3 and 4 months old, their sleep cycles shift and their development is simply blooming, which can temporarily hinder sleep.
If your little one used to be a stellar sleeper and now—suddenly—they are not, sleep regression might be to blame. Sleep regression signs include:
What’s changed? Your little blob of a newborn is now a 3- or 4-month-old social butterfly. They fall into a light sleep and wake up…bored! It’s too quiet and too still for your sweet pea. Your company-loving 4-month-old will wake up and think, “Hey you! Come back! I want to play!” But your baby’s new-found social tendencies aren’t the only thing contributing to the 3- to 4-month sleep regression. Your baby may also be…
Most parents are blindsided by the 3- to 4-month sleep regression and don’t know what to do. But if you learn to establish healthy sleep habits, you may be able to steer clear of most, if not all, of it. Here are more time-tested strategies for helping to avoid—and cope with—the 3- to 4-month sleep regression:
Happiest Baby’s SNOO Smart Sleeper is a big help and parents’ best tool for preventing the 3- to 4-month sleep regression. SNOO aids baby's sleep by using the rhythms they’re familiar with from the womb. (SNOO’s rocking, white noise, and swaddling are all part of the 5 S’s for soothing babies.) At the same time, SNOO quickly responds to upsets before they fully wake up. And because of SNOO’s patented swaddling system that keeps babies on their backs, SNOO babies can remain swaddled longer worry-free. (Traditional swaddling must stop when Baby can roll.)
Even if your baby does go through the 3- to 4-month sleep regression in SNOO, those with a Premium App subscription can easily adjust SNOO’s settings and “lock” SNOO at a higher level. Just like you would rock and hold your baby more vigorously when they’re going through a hard time, leveling SNOO up similarly “ups the ante.” Because you can so easily customize SNOO, I like to think of it as a “spot cure” during any stint of wakefulness (a growth spurt, a cold), giving babies the extra soothing they need so that when they stir, they don’t wake up all the way.
Disclaimer: The information on our site is NOT medical advice for any specific person or condition. It is only meant as general information. If you have any medical questions and concerns about your child or yourself, please contact your health provider. Breastmilk is the best source of nutrition for babies. It is important that, in preparation for and during breastfeeding, mothers eat a healthy, balanced diet. Combined breast- and bottle-feeding in the first weeks of life may reduce the supply of a mother's breastmilk and reversing the decision not to breastfeed is difficult. If you do decide to use infant formula, you should follow instructions carefully.