Sleep at 8 months: what’s normal, what’s hard, and when to call the doctor
At 8 months, the AASM range is 12 to 16 hours per 24 hours, including naps. Clinginess and bedtime protest are very common because stranger and separation anxiety are emerging; the AAP says separation anxiety usually peaks between 10 and 18 months. SIDS becomes less common after 8 months, but safe sleep rules still apply until the first birthday.
What is changing at 8 months
Your baby now knows exactly who you are, and minds when you leave. The AAP describes stranger anxiety as one of the first emotional milestones and says separation anxiety starts around the same time, usually peaking between 10 and 18 months. By 9 months, the CDC lists being shy, clingy or fearful around strangers and reacting when you leave by looking, reaching or crying.
Physically, many babies are pulling toward sitting, crawling and the first attempts to stand. The AAP and MedlinePlus say the crib mattress should be at its lowest setting before your baby can stand.
| Safe sleep after 8 months | What changes | What does not |
|---|---|---|
| SIDS risk | NICHD: SIDS is less common after 8 months | Safe sleep practices continue until the first birthday |
| Position | If your baby rolls both ways, you need not reposition them | Always place on the back to start |
| Mattress | Lowest setting before your baby can stand | Firm, flat, tight-fitting |
| Crib contents | Nothing new yet | No pillows, blankets, bumpers or soft toys before age 1 |
Separation anxiety often makes sleep advice that worked a month ago stop working. It needs warmth and predictability, not a method that leaves a baby alone. Actually Sleeping works with families at exactly this age, with a parent present and responsive and a plan Dr. Sam writes for your baby. It is not cry it out and not wait it out.
Nightmares are possible too. The AAP says they can start as young as 6 months and tend to come in the second half of the night. A baby who wakes frightened and settles quickly once you arrive is behaving normally. Studies of babies 7 to 11 months recorded about one night waking on average, with up to about three still within the normal range.
What parents find hardest
- Crying the moment you leave the room. The AAP notes children accept separation more easily when it is part of a predictable routine.
- Waking and calling for a parent. The AAP says a child with separation anxiety may need reassurance several times, night after night.
- Practising crawling or standing in the crib instead of sleeping.
- The 3-to-2 nap transition. Studies of babies 6 to 11 months found an average of about 2 naps a day; most 8 month olds are on two, as a common pattern.
Night feeds
Separation anxiety can look like hunger. A baby who wants you may also want to feed. Ask your pediatrician whether your baby still needs a night feed; if yes, keep it. A sleep plan works around that feed.
When to talk to the pediatrician
- Waking with fever, ear pain, vomiting, or a cough that is worse lying down.
- Regular snoring, mouth breathing or pauses in breathing at night.
- Your baby does not seem to know familiar people, or does not respond to their name by 9 months.
- Anxiety so intense that daytime life is very hard, or that does not ease at all over months.
Where to go from here
Separation anxiety is a reason to be warm and predictable at bedtime, not a reason to give up on better sleep. What warm and predictable looks like depends on your baby, and that is what Dr. Sam writes into the plan, with daily 1:1 check-ins. We guarantee that your baby will sleep 8–12 hours through the night within 14 days of consistent, correct implementation of your sleep plan. Other parents share their experience on our 7 to 9 month reviews. Related: separation anxiety at bedtime, the 8 to 10 month sleep regression, and the 8-month schedule. Book a free consultation to start.
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
Why does my 8 month old cry as soon as I leave the room at bedtime?
This is usually separation anxiety, a normal stage. The AAP says it often begins in the second half of the first year and usually peaks between 10 and 18 months. A predictable routine helps children accept separation, and Actually Sleeping builds one around your baby.
Is SIDS still a risk at 8 months?
Less so, but not zero. The NICHD says SIDS is less common after 8 months and that safe sleep practices should continue until the first birthday. Keep your baby on the back to start, on a firm, flat, empty surface.
When do I lower the crib mattress all the way?
Before your baby can stand. MedlinePlus and the AAP say to have the mattress at its lowest position before your child learns to stand. At 8 months, many babies are close, so it is safer to do it now.
References
- Paruthi S, et al. Recommended Amount of Sleep for Pediatric Populations: A Consensus Statement of the American Academy of Sleep Medicine. J Clin Sleep Med. 2016;12(6):785–786.
- HealthyChildren.org (AAP). Healthy Sleep Habits: How Many Hours Does Your Child Need?
- HealthyChildren.org (AAP). Emotional and Social Development: 8 to 12 Months.
- CDC. Milestones by 9 Months.
- HealthyChildren.org (AAP). Separation Anxiety & Sleeping Trouble in Young Children.
- HealthyChildren.org (AAP). Nightmares, Night Terrors & Sleepwalking in Children.
- NICHD Safe to Sleep campaign. SIDS by Baby's Age (text alternative).
- HealthyChildren.org (AAP). A Parent's Guide to Safe Sleep.
- MedlinePlus (U.S. National Library of Medicine). Crib safety tips.
- HealthyChildren.org (AAP). Make Baby's Room Safe: Parent Checklist.
- Galland BC, Taylor BJ, Elder DE, Herbison P. Normal sleep patterns in infants and children: a systematic review of observational studies. Sleep Med Rev. 2012;16(3):213–222.