Is it the 4 month sleep regression or a real sleep problem?
Usually it is both. From about 3 months, a baby’s sleep starts to organize into distinct cycles, and a baby who needs feeding or rocking to fall asleep now needs it again between cycles. That change is permanent, so waiting it out rarely helps. If sleep has stayed worse for weeks, it is a pattern, and a plan from Actually Sleeping can change it.
What actually changes
Young newborns sleep differently from older babies. By about 3 months, sleep starts to organize more like an older child’s: babies begin to fall asleep into non-REM sleep, hormone rhythms that shape day and night start cycling, and sleep runs in cycles of about 50 minutes. At the end of each cycle, your baby surfaces close to waking. A baby who fell asleep independently drifts back down. A baby who fell asleep feeding or being rocked wakes fully and needs it again. Nothing has gone backward. Your baby matured, and the old way of falling asleep stopped covering for it.
This is exactly the problem Actually Sleeping fixes. Dr. Sam writes a plan that teaches your baby to fall asleep independently, and you are coached hard before night one, so you go in confident. Hear from other parents in our 4-month regression reviews.
Phase or pattern
| Looks like a phase | Looks like a pattern |
|---|---|
| Started suddenly with an illness or travel | Started around 4 months and has not improved |
| Irregular: some nights are fine | Similar wake-ups at similar times most nights |
| Short-lived | Weeks and counting |
| Baby goes back down easily | Baby needs the bedtime routine again each time |
Why waiting and quick fixes rarely work
Because the underlying change is permanent, there is no end date to wait for. Quick fixes tend to move the problem rather than solve it: swap feeding for rocking and your baby needs rocking at 2 a.m. instead. Generic plans have another problem at this age. Some 4-month-olds still need night feeds, so a plan has to teach independent sleep while keeping whatever feeds your pediatrician wants. Getting that balance right depends on your baby’s feeding, growth, temperament, naps and how they fall asleep now.
How Actually Sleeping handles 4-month sleep
Dr. Sam writes the plan for your baby, paced for their age and temperament. Night feeds are never forced out; your pediatrician decides feeding. You get bootcamp-style coaching before the first night, daily 1:1 check-ins, and naps coached until solid. Habits at this age are newer and your baby is not yet mobile, which makes it a good time to start.
The guarantee clock starts at the 10-week birthday, so a 4-month-old is covered: “We guarantee that your baby will sleep 8–12 hours through the night within 14 days of consistent, correct implementation of your sleep plan.” If not, you get a full refund.
If sleep fell apart around 4 months and has not come back, book a free consultation and tell us what nights look like now.
Want this fixed for your baby?
Actually Sleeping is 1:1 coaching: a sleep plan written for your baby by Dr. Sam, bootcamp-style coaching before the first night, and daily check-ins until it is working. 700+ families coached, 129 video reviews, and a written guarantee: 8–12 hours through the night within 14 days, or a full refund.
Frequently asked
How long does the 4 month sleep regression last?
The underlying change is permanent, so it has no natural end date. What improves sleep is your baby learning to fall asleep independently. That is the focus of a Actually Sleeping plan, backed by a written guarantee and daily check-ins.
Can you sleep train during the 4 month regression?
Yes, and it is often a good time: habits are newer and your baby is not yet mobile. At Actually Sleeping, plans at this age are paced for the baby, and night feeds stay in until your pediatrician says otherwise.
Is my 4 month old hungry at night?
Possibly. Whether and how often your baby needs to eat at night is your pediatrician’s call. Not every waking is hunger, though. Many are cycle transitions. A Actually Sleeping plan keeps the feeds your pediatrician wants and changes how your baby falls asleep.