Most babies don’t sleep through the night until at least 3 months of age, and many not until closer to their first birthday. “Sleeping through the night” in infant terms means a stretch of 6 to 8 hours, not the 8 to 10 hours adults aim for. The good news: there are concrete steps you can take to help your baby get there, and understanding the biology behind infant sleep makes the whole process less frustrating.
Why Newborns Can’t Sleep Through the Night Yet
Your baby’s brain literally isn’t ready to produce the sleep hormone that regulates day-night cycles until several months after birth. The pineal gland is present at birth but doesn’t begin synthesizing melatonin in meaningful amounts until around 4 to 6 months of age. Before that point, babies have no internal clock telling them it’s nighttime. A stable circadian rhythm, where the baby consistently sleeps longer at night and stays more alert during the day, typically emerges between 13 and 15 weeks for most infants, though some take longer.
This is why sleep training before 3 to 4 months rarely works and isn’t recommended. You’re not doing anything wrong if your newborn wakes every 2 to 3 hours. Their biology demands it. Most babies are biologically capable of longer sleep stretches once they weigh 12 to 13 pounds and have started producing their own melatonin.
Building a Bedtime Routine
Consistency is the single most powerful tool you have. Babies learn to anticipate sleep through repeated cues, so doing the same sequence of activities every night trains their brain to wind down. A typical routine might include a warm bath, a feeding, a short book or song, and then placing the baby in the crib. The whole sequence should take about 20 to 30 minutes and end the same way every time.
Start this routine early, even at 6 to 8 weeks, before you plan to do any formal sleep training. The routine itself isn’t sleep training. It’s just building an association between certain activities and sleep, which pays off enormously later.
The “Drowsy but Awake” Approach
The core skill your baby needs to learn is falling asleep independently, meaning they go from awake to asleep without being held, rocked, or fed to sleep. The technique most pediatric sleep experts recommend is putting your baby down “drowsy but awake.” You watch for signs that sleep is coming: eye rubbing, a glazed-over stare, fussiness, or that particular kind of crying that signals tiredness rather than hunger or discomfort. When you see those cues, you place your baby in the crib while they’re still conscious.
This feels counterintuitive. If your baby is almost asleep in your arms, why not just let them drift off? Because a baby who falls asleep being held will wake up in an unfamiliar environment (the crib) and cry for the conditions they need to fall back asleep: your arms. A baby who learns to fall asleep in the crib can resettle themselves when they naturally wake between sleep cycles during the night.
Sleep Training Methods That Work
If drowsy-but-awake alone isn’t getting results by 4 to 6 months, structured sleep training methods can help. There’s no single “right” method. The best one is the one you’ll actually stick with.
Graduated Check-Ins
Often called the Ferber method, this involves putting your baby down awake, leaving the room, and returning at increasing intervals (3 minutes, then 5, then 10) to briefly reassure them without picking them up. The intervals teach your baby that you haven’t disappeared while still giving them space to learn self-soothing. Most families see significant improvement within 3 to 7 nights.
Pick Up, Put Down
This gentler approach works well for parents who aren’t comfortable with any crying. When your baby fusses, you pick them up and soothe them, but you put them back down before they fall asleep in your arms. The moment you see eyelids starting to droop, the baby goes back in the crib. You repeat this as many times as needed. It’s more labor-intensive and can take longer to produce results, but it keeps physical contact in the equation. The goal remains the same: the transition from wakefulness to sleep happens in the crib, not in your arms.
Chair Method
You sit in a chair next to the crib while your baby falls asleep, offering your presence but not picking them up. Every few nights, you move the chair farther from the crib until you’re outside the room. This is a slow method, often taking two to three weeks, but it works well for babies with strong separation anxiety.
When to Drop Night Feeds
Hunger is a legitimate reason babies wake at night, and pushing them to skip feeds before they’re ready backfires. Formula-fed babies can typically go without night feeds around 6 months, because formula digests more slowly and keeps them full longer. For breastfed babies, night feeds may remain genuinely necessary until around 12 months, since breast milk digests faster and some babies rely on nighttime calories to meet their daily intake.
If your baby is over 6 months, gaining weight normally, and eating well during the day but still waking to eat at night, the waking may be habit rather than hunger. You can gradually reduce night feeds by offering slightly less milk each time (or nursing for a shorter duration) over the course of a week or two, giving your baby’s appetite time to shift toward daytime calories.
Setting Up the Sleep Environment
The room itself matters more than most parents realize. Keep the nursery between 68 and 72°F (20 to 22°C). A room that’s too warm is both a sleep disruptor and a safety risk. Use blackout curtains to block early morning light, especially in summer months when sunrise can wake a baby at 5 a.m. White noise at a moderate volume helps mask household sounds and provides a consistent auditory cue for sleep.
For safety, the crib should have a firm, flat mattress with only a fitted sheet. No blankets, pillows, stuffed animals, or bumpers. Place your baby on their back for every sleep. These guidelines from the American Academy of Pediatrics apply for the entire first year, and following them removes the most significant risk factors for sleep-related infant deaths. If you’re worried about warmth, a wearable sleep sack replaces a blanket safely.
Sleep Regressions Are Normal Setbacks
Just when you think you’ve cracked the code, your baby may start waking again. Sleep regressions are temporary disruptions that tend to cluster around 4, 6, 8, 12, 18, and 24 months. They’re tied to developmental milestones, and knowing that helps you respond without abandoning your whole approach.
The 4-month regression is the most significant because it represents a permanent shift in how your baby’s brain handles sleep. Around this age, babies transition from newborn sleep patterns to more adult-like sleep cycles, which means more brief awakenings between cycles. This is actually a good thing long-term, but it can feel like a disaster in the moment. The 8-month regression often coincides with crawling, pulling to stand, and sometimes teething. The 18-month regression frequently involves a shift in circadian rhythms that makes toddlers fight their usual bedtime.
The key with regressions is to stay consistent. Offer comfort when needed, but try not to introduce new sleep associations (like rocking to sleep or bringing the baby into your bed) that you’ll then need to undo. Most regressions resolve within 2 to 4 weeks if you hold steady with your routines.
Common Mistakes That Delay Progress
Putting your baby to bed too late is one of the most frequent errors. An overtired baby produces stress hormones that make it harder to fall asleep and stay asleep. Most babies do best with a bedtime between 6:30 and 8:00 p.m., earlier than many parents expect. If your baby is fighting sleep at bedtime, try moving it 30 minutes earlier rather than later.
Rushing in at every sound is another common pitfall. Babies are noisy sleepers. They grunt, whimper, and even cry briefly between sleep cycles without fully waking. Pausing for a minute or two before responding gives your baby the chance to resettle on their own. A video monitor can help you distinguish between a baby who’s transitioning between sleep cycles and one who genuinely needs you.
Inconsistency undermines everything else. If you rock your baby to sleep some nights and put them down awake on others, or if one parent’s approach differs from the other’s, the baby never gets a clear, repeated signal about what bedtime looks like. Pick a method, align with your partner, and commit to it for at least two weeks before deciding it isn’t working.