The "8-month sleep regression" is the name parents use for the harder bedtimes, extra night waking and short or skipped naps that many babies have somewhere around 8 to 10 months. It isn't a medical diagnosis, and it doesn't arrive on a birthday. It usually lines up with real changes: separation anxiety, new skills like sitting up, crawling and pulling to stand, sometimes new teeth, and naps that are shifting.
The good news is that the basics help: a steady bedtime routine, plenty of practice for new skills during the day, calm and consistent responses at night, two naps for now, and a cot that's set up for a baby who can sit and stand.
When does the 8-month sleep regression start and how long does it last?
There's no fixed start date. Some babies have an unsettled patch at 7 months, others at 10 months, and some barely notice. If your baby was born early, their development may line up better with their corrected age.
Cleveland Clinic notes that research hasn't shown regressions happening like clockwork at a specific age for every baby, and says they typically last a week or two. No public-health source gives a reliable duration for this particular age. In real life, a patch can feel longer when separation anxiety, a new tooth and a nap change overlap.
What matters more than the calendar is direction. If things are slowly easing, keep going. If sleep is getting steadily worse, hasn't eased after a few weeks, or your baby seems unwell, check in with your GP or child-health nurse.
Why does sleep change at 8 to 10 months?
Separation anxiety
At around this age, babies start to understand that you still exist when you leave the room, and they mind. The CDC's 9-month milestone checklist includes being shy, clingy or fearful around strangers and reacting when you leave by looking, reaching for you or crying. The AAP says most babies develop more robust separation anxiety at around 9 months.
Bedtime is the longest separation of the day. The Sydney Children's Hospitals Network's page on separation anxiety and sleep says babies may cry at bedtime or wake up upset when they realise you're gone, and that separation anxiety happens most often between 6 months and 2 years. KidsHealth's guide for 8- to 12-month-olds says sleep problems are common in the second half of the first year, and links them to this normal stage of development.
Sitting, crawling and pulling up
By 9 months, the CDC lists sitting without support and getting into a sitting position alone. The CDC's 1-year checklist adds pulling up to stand. The Sydney Children's Hospitals Network names crawling and teething as milestones that can lead to periods of "sleep regression", including more waking at night.
A baby who has just learnt to pull up may wake between sleep cycles and practise straight away. Some then get stuck standing and can't work out how to get back down.
New teeth
The NHS teething guide says the lateral incisors, either side of the front teeth, usually come through at around 8 months. Possible signs include a sore, red gum, more dribbling and chewing, a slightly raised temperature under 38°C and not sleeping well. See teething for comfort ideas.
Naps on the move
The Sydney Children's Hospitals Network says babies may drop from three naps to two between 6 and 9 months. While naps are being reshuffled, some days end overtired, which can make nights harder. See three to two naps.
How much sleep does an 8-month-old need?
| Measure | Typical range | Source |
|---|---|---|
| Total in 24 hours | 12 to 16 hours, including naps | CDC, KidsHealth |
| Night sleep | 9 to 12 hours | KidsHealth |
| Naps | Usually two; 30 minutes to 2 hours each | KidsHealth |
The CDC's 9-month page says babies aged 4 to 12 months need about 12 to 16 hours of sleep a day, including naps. Pregnancy, Birth and Baby's guide to sleep patterns gives a slightly wider range of 11 to 16 hours for 6 to 12 months, and says many babies this age still wake at night and need help to go back to sleep. For example days, see the 6–8 month and 9–12 month schedules.
What helps during the 8-month sleep regression?
- Practise new skills during the day. Give lots of floor time for crawling, pulling up and, crucially, sitting back down from standing. Many families find a baby who has practised all day has less urge to practise at 2am.
- Keep the bedtime routine the same. The CDC suggests consistent routines for sleeping and feeding, because babies do better when they know what to expect. A short, predictable wind-down is reassuring for a baby who's anxious about separation. See bedtime routine.
- Practise goodbyes during the day. The CDC suggests a brief, cheerful goodbye rather than sneaking away, and telling your baby when you're back. Peekaboo and short trips out of the room help your baby learn that you come back.
- Respond calmly and consistently at night. Keep lights low and your voice quiet, and offer the least help your baby needs. Pregnancy, Birth and Baby suggests hands-on settling for older babies (patting or stroking in the cot with a gentle "shh"), or "camping out" beside the cot if your baby is distressed when you leave. See gradual retreat and responsive settling.
- Hold on to two naps. Use your baby's tired signs and wake windows as a rough guide so they don't reach bedtime overtired. See overtired baby.
- Think before adding back night feeds. If your baby is genuinely hungry, feed them. If a feed was dropped a while ago and your baby is waking for comfort, try other comfort first. The NHS guide to helping your baby sleep notes that teething discomfort or hunger may wake some babies between 6 months and a year.
If you feel overwhelmed, Pregnancy, Birth and Baby's crying baby guide advises placing your baby in their cot, walking away and returning when you feel calm. Never shake a baby.
When your baby stands in the cot and can't get down
At night, calmly help them down, lay them on their back and keep it brief. During the day, practise bending the knees and sitting down from standing at a couch or low table. Once they can get down on their own, many families find the night-time standing fades.
Is my 8-month-old ready to drop to one nap?
Usually not. Fighting a nap during a rough patch is common, but KidsHealth says most babies aged 8 to 12 months still take two naps. The Sydney Children's Hospitals Network's toddler sleep page says two naps will likely reduce to one between 12 and 18 months.
If a nap is refused, offer quiet time in the cot or a short outing, then try for the next nap a little earlier or bring bedtime forward. Dropping to one nap too soon can leave a baby overtired by evening, which can make nights harder. See two to one nap for when the real transition comes.
How do you keep sleep safe now your baby can sit and stand?
New skills change the cot set-up:
- Lower the cot base. Pregnancy, Birth and Baby's cot guide says an adjustable cot should be at the upper height only for babies who can't yet sit, pull up or stand, and at the lower height for older babies so they can't fall or climb out.
- Clear the cot. KidsHealth suggests checking for anything your baby can reach from a sitting or standing position. Keep the cot free of pillows, bumpers, soft toys and loose bedding. Pregnancy, Birth and Baby also says not to place a cot near anything hanging, such as curtains, curtain cords, appliance cords, pictures or mirrors.
- Keep placing your baby on their back. Safe to Sleep advises back sleeping for every sleep until 1 year. Once your baby can roll both ways on their own, you can let them stay in the position they choose.
- No swaddle once your baby can roll. Pregnancy, Birth and Baby's safe sleep guide says it's time to stop swaddling when your baby starts to roll, because they need their arms free while they sleep. A well-fitted sleeping bag is a common choice instead.
When should you get help?
A sleep regression never explains signs of illness. These tiers are based on the NHS guide to urgent medical help for under-5s.
Get medical advice today (GP or a health advice line (Pregnancy, Birth and Baby on 1800 882 436 in Australia, NHS 111 in the UK, your pediatrician's after-hours line in the US)) if your baby isn't feeding, has been vomiting for 24 hours, has a fever and seems unwell, or you feel something is wrong. Trust your instincts.
Talk to your GP or child-health nurse soon if:
- sleep is getting steadily worse, or hasn't eased after a few weeks
- your baby seems to be losing skills they had, or you're worried about their development
- separation distress lasts many months or seriously affects sleep, which the Sydney Children's Hospitals Network says is worth raising
- you're running on empty; you can also contact a perinatal support line (PANDA on 1300 726 306 in Australia, Samaritans on 116 123 in the UK, the National Maternal Mental Health Hotline on 1-833-852-6262 in the US) or a parenting support service (Tresillian or Karitane in Australia, your health visitor in the UK, your pediatrician's office in the US)
If you have thoughts of harming yourself or your baby, call a crisis line (Lifeline on 13 11 14 in Australia, Samaritans on 116 123 in the UK, 988 in the US) or your local emergency number (000 in Australia, 999 in the UK, 911 in the US) now.
What to note while it's happening
Write down when wakings happen, what your baby was doing (standing, crying for you, feeding) and what settled them, plus any new skill, tooth or nap change. After a week you'll usually see whether things are easing. Those notes also make a GP or child-health nurse visit quicker and more useful.
