4-month sleep regression: what it is and how to cope
5 min read
Quick answer
The 4-month sleep regression is the name parents give to a phase when a baby who was sleeping in longer stretches starts waking more often. It is not a medical term. The AAP explains that a baby's sleep cycles only become regular at roughly 4 months, so sleep is changing at this age. It does not mean anything has gone wrong.
- A parent term, not a medical diagnosis
- Sleep patterns are maturing around 4 months
- A calm, consistent bedtime routine may help your baby settle
- Keep following safe sleep advice as your baby becomes more mobile
- See your GP if waking comes with signs of illness or feeding problems
What is the 4-month sleep regression?
It is a popular name for more frequent night waking at around 4 months. Health services do not use the term, and not every baby has it. The AAP explains that babies under 4 months do not yet have regular sleep cycles, so their sleep is still developing around this time.
Many parents notice more waking around this age. It does not mean you have done anything wrong, and your baby's sleep will keep changing as they grow.
Signs of the 4-month sleep regression
Parents often notice a change from one week to the next. Common patterns include:
- Waking more often at night after a run of longer stretches
- Shorter naps or harder settling in the day
- Needing more help to fall back to sleep
- Wanting extra feeds or extra comfort
- More fussiness when tired
Why do babies wake more at 4 months?
Several normal things often happen at once. Alongside changing sleep cycles, the NHS lists hunger, being too hot or too cold, growth spurts, teething and illness as common reasons for disturbed sleep. The NHS also says that between 3 and 6 months some babies sleep 5 to 8 hours at night, but not all do, so there is no single normal.
Some babies start to roll around this time. If your baby rolls over, the NHS advises turning them onto their back again, and keeping this up until they can roll from back to front and front to back without help.
How to settle your baby during a sleep regression
There is no method that works for every baby, and no routine can promise a certain amount of sleep. These gentle ideas come from NHS and AAP advice.
- Keep a simple, calming bedtime routine: bath, fresh nappy, story, cuddle, dim lights
- Make days bright and playful, and nights dark, quiet and dull
- From 4 months, the AAP suggests putting your baby down drowsy but awake
- Try not to rush in at the first sound, but always go to them if they need feeding, a nappy change or comfort
- Feed and change calmly at night, without play or bright lights
- Try gentle background noise or stroking their back
Safe sleep during the 4-month sleep regression
Tired nights make it tempting to try anything that works. Safe sleep advice stays the same, and matters even more as your baby becomes more mobile.
- Always put your baby on their back to sleep, in a clear cot with a firm, flat mattress
- Keep your baby in your room for at least the first 6 months
- Keep the room at 16°C to 20°C (61°F to 68°F)
- Never sleep with your baby on a sofa or armchair
- No pillows, duvets, bumpers, soft toys, pods or nests in the cot
When to see a GP about sleep
Most extra waking at this age is normal. Contact your GP or NHS 111 if your baby has a high temperature, is not interested in feeding, or cries in a way that is unlike their normal cry. Call 999 (or your local emergency number) if your baby is floppy, harder to wake than usual, struggling to breathe, or has a rash that does not fade when pressed. Your health visitor can help with ongoing sleep worries.
Sources
We check this guide against these sources. It is general information, not medical advice: speak to your health visitor, GP or paediatrician about your own baby.
Questions parents ask
How long does the 4-month sleep regression last?
There is no official length because it is not a medical diagnosis. Many parents find it settles as their baby adjusts to more mature sleep, but every baby is different. If extra waking goes on for a long time, or you are worried, talk to your health visitor. They can look at your baby's feeding, growth and routine with you.
Should I start sleep training at 4 months?
The AAP suggests that from 4 months you can start putting your baby down drowsy but awake, so they learn to fall asleep on their own. There is no need to follow a strict programme, and no method can guarantee results. Choose what feels right for your family and ask your health visitor if you want support.
Is it normal for my 4-month-old to want more night feeds?
Yes, it can be. The NHS lists hunger and growth spurts among the reasons babies wake at night. Feed your baby when they seem hungry. If your baby is not interested in feeding, seems unwell or you are worried about how they are feeding, contact your GP, health visitor or NHS 111.
Does every baby have a 4-month sleep regression?
No. It is a parent term rather than a medical one, and the AAP notes that sleep needs vary from baby to baby. Some babies barely change around 4 months, others wake much more for a while. Either is normal. What matters is that your baby is feeding, growing and well, and that you get support too.