Self-soothing is a normal, healthy part of infant development, but timing matters. Babies gradually develop the ability to settle themselves back to sleep starting around 4 to 6 months of age. Before that point, most infants simply aren’t ready. Understanding when and how self-soothing develops can help you support your baby without pushing too early or holding back too long.
What Self-Soothing Actually Looks Like
Self-soothing doesn’t mean a baby cries alone until they give up. It means a baby wakes during the night, as all humans do between sleep cycles, and falls back to sleep without needing a parent to feed, rock, or hold them. This might involve sucking on fingers, shifting position, clutching a familiar blanket, or simply closing their eyes and drifting off again.
Longitudinal research tracking babies from birth to 12 months found that self-soothing increases steadily over the first year. At 1 month, babies put themselves back to sleep after about 28% of their nighttime awakenings. By 12 months, that number climbed to 46%. Babies also increasingly used sleep aids like thumbs, fingers, or comfort objects. By 6 months, infants used some kind of sleep aid during roughly 60% of their nighttime awakenings, up from 30% at 1 month.
Why Newborns Can’t Self-Soothe Yet
During the first few months of life, babies almost always fall asleep during or right after a feeding, both at bedtime and in the middle of the night. Self-soothing at this age is rare, and for good reason. Young infants have small stomachs that need frequent refilling, and their brains haven’t yet developed the capacity for emotional self-regulation. Babies who showed more quiet, organized sleep patterns from birth were more likely to become effective self-soothers later, suggesting that neurological maturity plays a significant role in when this skill emerges.
The takeaway: expecting a newborn to self-soothe is not realistic and not recommended. The 4 to 6 month window is when these behaviors naturally begin to appear in some babies, and they continue developing through the first birthday and beyond.
Does Self-Soothing Cause Stress?
This is the question most parents are really asking. The concern is that leaving a baby to settle on their own raises stress hormones and causes lasting harm. The research here is more reassuring than many parents expect.
Multiple studies have measured cortisol, the body’s primary stress hormone, in infants during and after sleep interventions. A 2016 study found that babies who learned to self-soothe through graduated sleep training showed no adverse stress responses and no long-term negative effects. The cortisol measurements taken during bedtime separation did not differ between babies in sleep training groups and those in control groups. Morning-after cortisol readings also showed no elevation.
One study did find elevated cortisol in infants during a strict extinction protocol (where parents don’t return to the room at all), but studies using gentler, responsive approaches, where parents actively check in and settle the baby, found no cortisol elevation. The method matters. Responsive approaches that involve brief parental check-ins appear to keep stress within normal ranges.
For context, infant cortisol typically spikes 20 to 30 minutes after any acute stressor (like a vaccination) and returns to baseline within about two hours. Brief periods of mild stress are a normal part of development, not inherently harmful.
No Evidence of Attachment Harm
The other major worry is that self-soothing will damage the parent-child bond. A systematic review of studies on attachment and sleep found no consistent evidence that sleep training harms attachment security. One longitudinal study found that infant-mother attachment was not related to sleep problems at all. Another found that securely attached children actually slept more at night and had better sleep efficiency, suggesting that a strong bond and good independent sleep aren’t in conflict.
Securely attached children tend to be better at self-regulating at bedtime, settling peacefully after a night waking and sleeping longer overall. In other words, a secure attachment may actually support self-soothing rather than compete with it.
What Helps Babies Learn to Self-Soothe
Three factors stood out as the strongest predictors of self-soothing at 12 months in longitudinal research: spending decreasing amounts of time out of the crib over the first year, having more organized sleep patterns at birth, and parents waiting slightly longer before responding to nighttime awakenings at around 3 months. That last point doesn’t mean ignoring your baby. It means pausing briefly before rushing in, giving your baby a moment to see if they resettle on their own.
One of the simplest, most consistent findings is that babies placed in their cribs while still awake had higher rates of self-soothing. This makes intuitive sense. If a baby always falls asleep in your arms and then wakes up in a crib, the change in environment is disorienting. A baby who falls asleep in the crib learns that the crib is where sleep happens and becomes more comfortable returning to sleep there after waking.
The AAP notes that parents often default to feeding, holding, or rocking babies to sleep because it works in the moment. But placing babies down awake in a safe sleep space promotes both self-soothing and adherence to safe sleep guidelines (alone, on their back, in a crib).
Graduated Methods and What to Expect
The most widely studied approach is graduated extinction, sometimes called the Ferber method. You put your baby down awake, leave the room, and return to briefly check in at increasing intervals. The first night you might wait three minutes before your first check-in, then five, then ten. The next night, you start at five minutes and work up from there. The intervals are flexible. Some families use 10, 20, and 30 minute intervals instead. The core principle is the same: intervals get longer, giving the baby progressively more time to practice settling.
Research on this approach found that babies who went through graduated sleep training fell asleep about 15 minutes faster than babies who didn’t. That may sound modest, but for an exhausted parent enduring 45 minutes of bedtime struggles every night, cutting that time significantly changes the experience for the whole household.
If your baby is crying and you’ve checked that they’re not hungry, sick, or in discomfort, it’s safe to let them cry in their crib for about 10 to 15 minutes. Many babies need a short period of fussing before they can fall asleep, and they often settle faster when given the space to do so.
The Connection to Parental Mental Health
Infant sleep difficulties don’t just affect the baby. Research following mothers from pregnancy through the first year found a consistent link between infant sleep problems and higher scores on depression screening tools, both at 6 weeks and 12 months postpartum. Mothers who already had mental health risk factors during pregnancy were more likely to report infant sleep difficulties, and those difficulties in turn were associated with worsening depression scores over time.
This creates a cycle: a parent who is sleep-deprived and struggling with their mental health has fewer resources to respond sensitively to their baby, which can make sleep problems harder to resolve. Helping a baby develop self-soothing skills, when they’re developmentally ready, can break that cycle. A baby who sleeps more independently means a parent who sleeps more, and a better-rested parent is a more responsive parent during waking hours.
How to Read Your Baby’s Readiness
Not every baby hits the same milestones on the same schedule. Some babies begin self-soothing behaviors earlier, and some take longer. Signs your baby may be ready include sucking on fingers or hands, turning their head to find a comfortable position, and being able to settle with a comfort object like a pacifier. Babies who naturally have longer stretches of calm, quiet sleep tend to develop self-soothing earlier, likely because their nervous systems are maturing faster.
If your baby is under 4 months, responding promptly to their cries is appropriate and expected. Between 4 and 6 months, you can begin experimenting with putting your baby down drowsy but awake and pausing briefly before responding to nighttime stirring. By 6 months, most healthy babies are developmentally capable of beginning to practice self-soothing in earnest, though some will take longer, and that’s normal too.