Published by Actually Sleeping · Reviewed by Dr. Samantha Abrahamson, PharmD · Review policy · Updated 2026-11-10

Sleep at 4 months: what’s normal, what’s hard, and when to get help

From 4 months, the AASM recommends 12 to 16 hours of sleep per 24 hours, including naps, and the AAP supports that range. Sleep cycles become more adult-like around now, so many babies start waking more between cycles. Rolling is common, teething may begin, and the AAP suggests putting babies 4 months and older to bed drowsy.

What is changing at 4 months

The AAP says babies do not have regular sleep cycles until about 4 months. Once they do, there are more brief wake-ups between cycles. A baby who was rocked fully asleep may now need the same help several times a night. That is the change people call the 4-month regression; it is a developmental step that tends to stick.

By 4 months, the CDC lists pushing up onto elbows during tummy time, holding the head steady, bringing hands to mouth, chuckling, and moving or making sounds to keep your attention. Teething can also start: the AAP says it typically begins by about 4 to 7 months.

Measure at 4 months	Figure	Source
Recommended total sleep	12 to 16 hours per 24 hours, including naps	AASM, supported by AAP
Average total in studies, from 3 months	13.6 hours	Galland 2012
Daytime sleeps, 0 to 5 months	About 3 on average, often 3 to 4	Galland 2012
Night wakings, 3 to 6 months	0.8 on average, 0 to 3 is within normal	Galland 2012

This is the age when many families first look for help. A baby who needs feeding or rocking at bedtime tends to need it at every cycle. Actually Sleeping changes that with a plan Dr. Sam writes for your baby, bootcamp-style coaching before night one, and daily 1:1 check-ins. It is not cry it out and not wait it out.

The nap count is a common pattern, not a rule. Some 4 month olds take three long naps, others four or five short ones.

What parents find hardest

Frequent waking after months of better nights. Often a sleep-association problem appearing, not hunger. Ask the pediatrician before assuming either way.
Rolling in the crib. Babies roll onto their tummy and get annoyed, or practise rolling instead of sleeping.
Short naps. Naps of a single sleep cycle are very common at this age.
Distracted daytime feeds that shift calories into the night.

Safe sleep at 4 months

Still place your baby on the back for every sleep. The AAP says that once your baby rolls both ways, back to tummy and tummy to back, you do not need to keep turning them over, as long as the sleep space is empty.
No swaddle once rolling attempts begin. Arms-free sleep sacks only, and never weighted.
Keep room-sharing without bed-sharing, ideally for at least the first 6 months.
If you still use a bassinet, plan the move: the CPSC says they are not meant for use beyond about 5 months or once a baby can push up on hands and knees.

Night feeds

Some 4 month olds still need one or more night feeds and some do not. That decision belongs to your pediatrician, based on weight gain. The plan you choose should work around those feeds, not cut them.

When to talk to the pediatrician

Fever above 101°F (38.3°C). The AAP says teething does not cause a fever that high, so it needs a look.
Frequent snoring, laboured breathing, or daytime sleepiness that seems excessive.
Sudden frequent waking with fever, ear pulling, vomiting or poor feeding.
Not yet holding the head steady or pushing up on the forearms.

Where to go from here

The AAP’s advice for babies 4 months and older is to put them to bed drowsy rather than asleep. Getting a specific baby there, without tears you are not comfortable with and without cutting feeds, is the part generic advice leaves out. Actually Sleeping writes plans for this stage that keep any pediatrician-approved night feeds in place, and coaches naps until they are solid. We guarantee that your baby will sleep 8–12 hours through the night within 14 days of consistent, correct implementation of your sleep plan. Parents who started at exactly this stage tell their stories on our 4-month regression reviews. Related: the 4-month sleep change, the 4-month schedule, and the feed-to-sleep association. Book a free consultation with Dr. Sam to talk through your baby’s nights.

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Frequently asked

How many hours should a 4 month old sleep?

The AASM recommends 12 to 16 hours per 24 hours, including naps, for babies 4 to 12 months, and the AAP supports that range. Healthy babies vary, so look at mood, feeding and growth along with the total.

Is the 4-month regression real?

Something real does change. The AAP says regular sleep cycles appear around 4 months, which means more brief wakings between cycles. Babies who need feeding or rocking to fall asleep often need the same help each time they surface. That pattern is what Actually Sleeping coaches.

My 4 month old rolls onto their tummy in the crib. What do I do?

Keep placing your baby on the back. The AAP says once your baby rolls comfortably both ways you do not need to keep turning them, provided there are no blankets, pillows, toys or bumpers in the crib. Make sure the swaddle is gone.

Is my 4 month old teething?

Possibly. The AAP says teething typically starts by about 4 to 7 months. It can cause a slight rise in temperature, but not above 101°F (38.3°C). A higher fever is not from teething; call your pediatrician.