Most 8-month-olds are developmentally ready for sleep training, and with a consistent approach, you can expect noticeable improvement within three to seven nights. The key is choosing a method that fits your comfort level, setting up the right schedule beforehand, and staying consistent through the inevitable rough patches that come with this particular age.
Get the Schedule Right First
Sleep training works best when your baby’s daytime schedule supports it. At 8 months, most babies do well on two naps totaling 2.5 to 3.5 hours of daytime sleep, with wake windows of 2.5 to 3.5 hours between sleep periods. A bedtime between 7:00 and 8:00 p.m. hits the sweet spot for this age.
If your baby is overtired or undertired at bedtime, no method will work smoothly. An overtired baby produces more stress hormones, making it harder to fall asleep. An undertired baby simply isn’t ready. Nail the schedule for a few days before you start training, so you’re not fighting biology on top of everything else.
Decide Whether to Keep Night Feeds
Sleep training and night weaning are two separate things, and you don’t have to tackle both at once. Formula-fed babies over 6 months are unlikely to wake from genuine hunger, so dropping night feeds is reasonable. For breastfed babies, night feeds can continue well into the first year without undermining sleep training.
If your baby still takes a night feed and you want to keep it, simply feed when they wake, then put them back down awake. If you’d like to phase it out, reduce the bottle volume by 20 to 30 ml every other night over about a week. Feeds under 60 ml can typically be dropped altogether.
The Ferber Method: Timed Check-Ins
This is the most widely used approach for 8-month-olds. You put your baby down awake after their bedtime routine, leave the room, then return at gradually increasing intervals to briefly reassure them. Check-ins should last under two minutes: a calm voice, a quick pat, then leave again. The goal is to show your baby you’re still there while giving them space to figure out falling asleep on their own.
The interval schedule looks like this:
- Night 1: Wait 3 minutes before the first check, then 5 minutes, then 10 minutes for all checks after that.
- Night 2: Start at 5 minutes, then 10, then 12 for subsequent checks.
- Night 3: Start at 10 minutes, then 12, then 15.
- Night 4: Start at 12 minutes, then 15, then 17.
- Night 5: Start at 15 minutes, then 17, then 20.
The intervals keep increasing through day 7 and beyond if needed. If your baby falls asleep but wakes later in the night, restart the intervals from the beginning of that night’s schedule. Most families see a dramatic shift by nights 3 or 4, with the first two nights being the hardest.
The Chair Method: Gradual Withdrawal
If timed check-ins feel too hands-off, the chair method lets you stay in the room until your baby falls asleep. After completing the bedtime routine, place your baby in the crib drowsy but awake, then sit in a chair next to the crib. Don’t pick them up or engage much. Just be a calm, boring presence.
Every two to three nights, move the chair a bit farther from the crib: next to the crib, then halfway to the door, then by the door, then just outside it, and eventually gone. If your baby wakes and cries, return to wherever the chair is positioned that night and sit quietly until they settle. You don’t actually need a chair for this. Standing and gradually moving toward the door works the same way.
This method takes longer, often up to two weeks, and requires more patience. But for parents who aren’t comfortable leaving a crying baby alone, it offers a middle ground.
Why 8 Months Is Tricky
Eight months is a busy developmental window. Many babies are learning to crawl, pull to stand, and sit up independently, all at the same time. Separation anxiety also tends to peak around this age. These milestones can trigger a sleep regression even in babies who previously slept well, and they can make sleep training bumpier than it would be at, say, 5 or 6 months.
None of this means you should wait. It just means you should expect your baby to practice new skills in the crib. Standing up and not knowing how to get back down is the single most common complaint parents have at this age.
When Your Baby Keeps Standing Up
If your baby pulls to stand in the crib and then fusses because they’re stuck, the fix starts during the day. Practice sitting down from standing and lying down from sitting during playtime, over and over, so the skill becomes automatic. At night, calmly lay your baby back down once or twice, but don’t turn it into a game of pop-up. After a couple of attempts, let them figure it out.
A sleep sack can slow down the standing habit by making it harder to get a firm footing. This buys time while your baby is still mastering the skill. More importantly, lower the crib mattress to its lowest setting now if you haven’t already. At 8 months, a baby standing in a crib is top-heavy, and the top rail should hit at least mid-chest when they’re upright.
Handling Teething During Training
Teething is common at 8 months, and it can be hard to tell whether crying is from discomfort or from protesting the new sleep routine. If your baby is actively cutting a tooth, with swollen gums, drooling, and daytime fussiness, it’s reasonable to offer a little extra comfort. A brief pat or body stroke while they’re in the crib can bridge the gap without creating new habits.
The important thing is to still put your baby down the same way you normally would. Adding temporary comfort on top of your routine is fine. Replacing your routine with rocking or feeding to sleep will create new associations you’ll need to undo once the tooth comes through. If teething seems severe, with persistent fever, rashes, or inconsolable crying that lasts beyond a few days, that’s worth a conversation with your pediatrician rather than a sleep training adjustment.
Keeping the Crib Safe
Sleep training means your baby will spend time awake and alone in the crib, so the sleep environment matters more than ever. The AAP recommends placing babies on their backs for every sleep until age 1, on a firm, flat mattress with only a fitted sheet. No pillows, blankets, bumper pads, or stuffed animals. If your baby rolls onto their stomach on their own and can roll both ways, they can stay in whatever position they choose.
Check that no cords, wires, or window coverings are within reach of the crib. Skip memory foam or adjustable-firmness mattresses, which can create indentations that pose a suffocation risk.
What to Expect Night by Night
With the Ferber method or similar approaches, the first night often involves 30 to 60 minutes of crying. The second night is frequently worse, not better, as your baby tests whether the new rules are really permanent. By night 3 or 4, most babies cry significantly less and fall asleep faster. By the end of the first week, many are falling asleep independently within 10 to 15 minutes.
Gentler methods like the chair approach or fading take longer, often closer to two weeks before you see consistent results. The tradeoff is less intense crying in the short term.
Whichever method you choose, consistency is the single biggest predictor of success. If you do timed check-ins for two nights, then give up and rock your baby to sleep on night 3, you’ve taught them that extended crying eventually gets the result they want. Pick a method you can actually stick with for a full week, even on the hard nights.