Six months is one of the most popular ages to start sleep training, and for good reason. Most 6-month-olds are developmentally ready to sleep six to eight hours straight without a feeding, and their growing awareness of the world means they’re capable of learning new sleep habits. The process typically takes three to seven nights depending on the method you choose and how consistent you are.
Why 6 Months Is the Right Time
Around 6 months, babies hit a cluster of developmental changes that make sleep training both possible and, for many families, necessary. Your baby is starting to understand object permanence, the concept that people and things still exist even when out of sight. That’s a cognitive leap that cuts both ways: it means your baby can learn to trust you’ll return in the morning, but it also means they now realize you’ve left the room and may protest more loudly about it.
Physically, 6-month-olds can roll from tummy to back, push up on straight arms, and lean on their hands while sitting. They’re strong enough to find comfortable positions in the crib on their own. And calorically, most babies this age no longer need nighttime feedings. UCSF Benioff Children’s Hospitals notes that while many babies still wake to eat at night, they’re doing so out of habit rather than nutritional need.
Set Up the Right Sleep Environment
Before you choose a method, get the basics in place. Keep the room between 68 and 72 degrees Fahrenheit, which research suggests is the comfortable range for infants. Make the room as dark as possible. Dress your baby in clothing appropriate for the temperature rather than relying on extra blankets, which shouldn’t be in the crib anyway.
Establish a short, predictable bedtime routine: a bath, a feeding, a book, a song, whatever combination works for your family. The routine itself matters less than doing it the same way every night. The goal is to put your baby down drowsy but awake, so they learn to bridge the gap between sleepy and asleep without you.
Get the Daytime Schedule Right First
Sleep training at night will go much more smoothly if your baby isn’t overtired at bedtime. At 6 months, most babies need two to three hours of awake time between sleep periods, with wake windows getting longer as the day goes on. Your baby might need only two hours of awake time before the first nap but closer to three hours before bed.
Aim for 2.5 to 3.5 hours of total daytime sleep, usually spread across two or three naps. If your baby is down to just two naps, watch for signs of overtiredness like increased night waking or early morning wake-ups. On days when the last nap gets skipped or runs short, move bedtime earlier by 15 to 30 minutes to compensate. An overtired baby actually has a harder time falling asleep, which can make sleep training feel like it isn’t working.
Graduated Check-Ins (Ferber Method)
This is the most widely used sleep training approach. You put your baby down awake, leave the room, and return at gradually increasing intervals to briefly reassure them. You don’t pick them up during check-ins. You might pat their chest, say a few calm words, then leave again.
The schedule for the first week looks like this:
- Night 1: Wait 3 minutes before your first check, then 5 minutes, then 10 minutes between all remaining checks.
- Night 2: Start at 5 minutes, then 10, then 12 for all remaining 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.
- Night 6: Start at 17 minutes, then 20, then 25.
- Night 7: Start at 20 minutes, then 25, then 30.
These intervals come from Dr. Richard Ferber’s book, but he notes they can be adjusted to fit your comfort level. If starting at 3 minutes feels too short and you’d rather begin at 5, that’s fine. The principle is what matters: each night, you wait a little longer before going in, and your baby gradually learns to settle without you. Many families see significant improvement by nights 3 or 4.
The Chair Method
If leaving the room entirely feels too abrupt, the chair method lets you stay present while gradually withdrawing. You place a chair right next to the crib and sit there while your baby falls asleep. You can offer gentle verbal reassurance, but you avoid picking them up or doing the work of putting them to sleep.
Every few nights, you move the chair a little farther from the crib. First toward the middle of the room, then near the door, then just outside the door, and eventually you’re gone entirely. This method tends to take longer than graduated check-ins because the withdrawal is more gradual. There’s no fixed timeline for when your baby will be comfortable with you fully out of the room, so patience is key.
Pick Up, Put Down
This is one of the gentler options and works well for parents who want more physical contact during the process. You put your baby down awake. When they fuss or cry, you pick them up and soothe them. The critical part: as soon as you see their eyelids start to droop, you set them back in the crib before they actually fall asleep. You repeat this cycle, picking up to comfort and putting down to sleep, as many times as needed until they finally drift off on their own.
The pick up, put down method can be more labor-intensive in the early nights. You might find yourself repeating the cycle dozens of times before your baby stays down. But for families who want to minimize crying, it offers more hands-on reassurance than other approaches.
Handling Night Feedings
One of the biggest questions parents have is whether to keep feeding overnight. At 6 months, most babies don’t need nighttime calories to grow properly. If you want to drop night feeds, you can do so gradually. For breastfeeding, try nursing from only one side at night to reduce the amount of milk your baby gets during those sessions. For bottle feeding, you can offer water instead of formula to make the wake-up less rewarding.
Some parents prefer to keep one night feeding while sleep training for everything else, and that’s a reasonable middle ground. The key is consistency: decide in advance which wake-ups get a feeding and which get the sleep training response, so your baby gets clear signals about what to expect.
Common Setbacks at 6 Months
Even with a solid plan, a few things can derail progress. Teething often kicks in around this age and can cause genuine discomfort that disrupts sleep. If your baby is clearly in pain, it’s okay to pause and provide comfort, then resume training once the worst has passed. New physical skills like sitting up or early crawling can also cause temporary excitement at bedtime. Your baby may want to practice their new abilities instead of sleeping. This typically resolves on its own within a few days.
Object permanence, that same milestone that makes sleep training possible, can also trigger a regression. Your baby now knows you exist even when you leave the room, and they may call for you more insistently. This is normal and doesn’t mean sleep training is failing. Stay consistent with whatever method you’ve chosen. Going back and forth between approaches tends to extend the process and confuse your baby about the expectations.
Is Sleep Training Safe?
A study supported by the American Academy of Pediatrics divided infants into two groups: one that went through sleep training and one that didn’t. Researchers measured cortisol (a stress hormone), parental stress levels, and attachment style at one year. Babies in the sleep training group actually showed decreased cortisol levels by the end of training, and there was no difference in attachment security or behavioral problems between the two groups. Separate research has linked better infant sleep to stronger cognitive and language development in toddlerhood.
The short-term crying that happens during sleep training is not the same as chronic, unaddressed stress. Extended activation of a child’s stress response, the kind caused by ongoing environmental or emotional adversity, can have lasting health effects. A few nights of protesting at bedtime while a loving parent checks in at intervals does not fall into that category.