Getting a baby to sleep comes down to three things: timing it right, building a consistent routine, and helping your baby learn to fall asleep without needing you to do it for them. The specifics look different depending on your baby’s age, but those principles hold from the newborn weeks through the first year and beyond.
Why Newborns Sleep So Differently
Newborns don’t produce their own melatonin. Their sleep is scattered evenly across day and night with no real pattern, and they sleep in roughly four-hour chunks. This isn’t a problem to fix. It’s biology. Around five weeks, a faint circadian rhythm starts to emerge, and by about 15 weeks, most babies begin consolidating their sleep into longer stretches. By six to nine months, many babies can sleep six or more hours straight at night.
Knowing this timeline matters because it sets realistic expectations. A six-week-old who won’t sleep longer than three hours isn’t broken. A four-month-old who suddenly starts waking more often isn’t regressing permanently. Your baby’s internal clock is still under construction, and your job in the early months is mostly to support that process rather than fight it.
Catch the Sleep Window
Babies give clear signals when they’re ready for sleep, and putting them down during that window makes everything easier. Early tired signs include droopy eyelids, yawning, staring into the distance, rubbing their eyes, pulling their ears, and turning away from sounds, lights, or feeding. Some babies make a low, prolonged whine (sometimes called “grizzling”) that never quite escalates into full crying. Fist clenching and back arching are also common cues that get overlooked.
If you miss that window, your baby becomes overtired, which paradoxically makes sleep harder. Overtired babies get flooded with cortisol and adrenaline, the same stress hormones that keep adults wired after an exhausting day. Instead of getting drowsier, they become more agitated, cry louder and more frantically, and may even start sweating from the cortisol spike. An overtired baby can take significantly longer to settle. Watching for those early cues and acting on them is one of the most effective things you can do.
How Much Sleep to Expect by Age
Newborns from birth to three months need 11 to 17 hours per day, spread across short sleep periods around the clock. From four to twelve months, the recommendation is 12 to 16 hours total including naps. Some babies in that range take one nap, others take two or three. There’s wide variation, and all of it is normal. Once your baby reaches the toddler stage (12 to 24 months), the target drops slightly to 11 to 14 hours including naps.
These ranges are useful as a rough guide, but individual babies vary. What matters more is whether your baby seems rested during awake periods. A baby who’s getting enough sleep is alert, engaged, and interested in their surroundings when awake.
Build a Short, Consistent Routine
A predictable bedtime sequence signals to your baby’s brain that sleep is coming. It doesn’t need to be elaborate. Research on bedtime routines in young children found that a simple three-step sequence, a bath followed by a massage or lotion application followed by quiet activities like cuddling or singing, completed within 30 minutes, was effective at improving how quickly children fell asleep and how long they stayed asleep.
The specific activities matter less than the consistency. You could do a bath, a book, and a song. Or a diaper change, pajamas, and a lullaby. What trains your baby’s brain is the same sequence happening in the same order at roughly the same time each night. Over days and weeks, those cues become powerful sleep signals on their own.
Put Your Baby Down Drowsy but Awake
This is the single most repeated piece of advice in pediatric sleep guidance, and it exists for a good reason. Babies wake briefly between sleep cycles, just like adults do. If your baby fell asleep being rocked or fed, they expect those same conditions when they surface between cycles. When the rocking or feeding isn’t there, they wake fully and cry for you to recreate it. This can happen multiple times per night.
When a baby practices falling asleep in their crib while still slightly awake, they start associating the crib itself with falling asleep. That means when they wake between sleep cycles at 2 a.m., they’re more likely to drift back off on their own because the conditions haven’t changed. Sleep associations like white noise, a dark room, or a sleep sack work in your favor here because they stay constant all night. Associations that require your active involvement, like rocking, feeding, or holding, tend to create more night wakings over time.
Sleep Training Methods
Sleep training is generally appropriate starting around four to six months, once your baby’s circadian rhythm is more established. The most studied approach is graduated extinction, sometimes called the Ferber method. You put your baby in the crib drowsy but awake, leave the room, and if they cry, wait two to five minutes before briefly returning to offer reassurance without picking them up. You leave again and extend the interval by another two to five minutes. You repeat this pattern until the baby falls asleep.
The waiting intervals stretch over successive nights. Most families see significant improvement within a week. This method works because it gives your baby repeated, low-stakes opportunities to practice falling asleep independently while still checking in so they know you’re nearby.
Not every family is comfortable with this approach, and that’s fine. Gentler alternatives include sitting in a chair next to the crib and gradually moving it farther away over several nights, or picking your baby up to calm them when they cry and putting them back down once they’re settled, repeating as needed. These methods generally take longer but follow the same underlying principle: your baby is the one who does the final act of falling asleep.
Set Up the Room for Sleep
The ideal nursery temperature is between 68 and 72 degrees Fahrenheit (20 to 22 Celsius). Babies sleep poorly when they’re too warm, and overheating is also a safety concern. Dress your baby in one layer more than you’d wear comfortably in the same room, and skip the blankets entirely for the first year.
Darkness matters once your baby starts producing melatonin. Blackout curtains help, especially in summer when daylight extends past bedtime. White noise is useful for masking household sounds, and because it stays constant all night, it’s a sleep association that works in your favor rather than against you. Keep the volume moderate, roughly the level of a running shower.
For safety, the American Academy of Pediatrics recommends placing babies on their backs in their own sleep space with a firm, flat mattress and a fitted sheet. Keep loose blankets, pillows, stuffed animals, and bumper pads out of the crib. Avoid letting your baby sleep on couches, armchairs, or in swings and car seats (outside the car). Room-sharing without bed-sharing is recommended for at least the first several months.
When Sleep Falls Apart
Most babies experience at least one sleep regression in their first year, often starting around four months. These aren’t tied strictly to age. They’re tied to what’s happening in your baby’s life: a growth spurt that demands extra feedings, a new motor skill like rolling over or pulling up that they want to practice at 3 a.m., illness, teething pain, travel, or the onset of separation anxiety (which commonly peaks around nine months).
Sleep regressions feel brutal, but they’re temporary. The best strategy is to keep your routine consistent and avoid introducing new sleep crutches you’ll later need to undo. If your baby needs extra comfort during a bout of teething or illness, provide it, but return to your normal approach once they’ve recovered. Most regressions resolve within two to four weeks when routines stay steady.
Daytime Habits That Affect Night Sleep
Exposure to natural light during the day helps your baby’s circadian system develop faster. One case study of an infant raised with only natural light for the first six months showed measurable sleep rhythms appearing far earlier than typical, with nighttime sleep onset aligning with sunset by day 60. You don’t need to go off-grid, but getting your baby outside during daylight hours, especially in the morning, supports the internal clock you’re trying to build.
Nap timing also matters. A baby who naps too late in the afternoon will have trouble falling asleep at bedtime, while a baby who skips naps entirely becomes overtired and harder to settle. As a general rule, keep at least a two to three hour gap between the end of the last nap and bedtime. If your baby is between four and twelve months and still taking multiple naps, the final nap of the day should be the shortest one.