Quick Answer
Most babies begin to sleep one longer stretch of 4–6 hours at night somewhere between 6 and 12 weeks, though there is wide variation. By 3 to 4 months, many babies can manage a 5–6 hour stretch. By 6 months, a significant number sleep 6–8 hours or more — but this is not universal, and frequent waking beyond 6 months is still within the normal range.
What to Expect by Age
- 0–6 weeks: Waking every 1.5–3 hours is normal and expected. The stomach is too small to sustain longer stretches, and there is no established circadian rhythm yet.
- 6–12 weeks: Some babies begin to consolidate one slightly longer stretch of 3–4 hours, usually in the first part of the night. Many do not — both are normal.
- 3–4 months: The circadian rhythm begins to establish and melatonin production matures. Some babies produce a 5–6 hour stretch. The 4-month sleep regression can temporarily disrupt progress at this stage.
- 4–6 months: Many babies are capable of a 6–8 hour stretch, though feeding needs, sleep associations, and individual temperament mean many still wake more frequently.
- 6–12 months: With the introduction of solid foods and continued neurological maturation, more babies consolidate night sleep. However, frequent waking at this age is still common and normal.
What Influences When It Happens
- Birth weight and growth: Larger babies with greater fat stores may manage longer stretches earlier. Smaller or premature babies typically take longer.
- Feeding method: Formula takes longer to digest than breast milk, so formula-fed babies may consolidate night sleep slightly earlier on average — though the difference is smaller than many expect.
- Sleep associations: Babies who fall asleep being fed or held often need the same conditions to resettle between cycles, which can increase night waking regardless of age.
- Temperament: Some babies are naturally more sensitive sleepers and take longer to consolidate night sleep regardless of what parents do.
- Developmental leaps: Growth spurts and developmental milestones can temporarily increase night waking at any age.
What Parents Can Try
- Encourage day/night distinction early: Keep daytime feeds bright and stimulating; keep night feeds calm, dark, and quiet
- Watch wake windows: An overtired baby often sleeps worse — keeping wake windows age-appropriate can improve night sleep quality
- Offer a full feed before bed: A well-fed baby is more likely to manage a longer first stretch
- Practice putting down drowsy but awake: From around 3–4 months, this gives babies the opportunity to practice falling asleep independently, which supports longer stretches
- Consistent bedtime routine: A short, predictable wind-down routine signals to the brain that a longer sleep period is coming
When It’s Worth Checking In With Your Pediatrician
Speak to your pediatrician if:
- Your baby is not gaining weight adequately alongside frequent night waking
- Night waking is increasing significantly after 6 months rather than gradually improving
- Your baby seems to be in pain or discomfort when waking, which may indicate reflux or another issue
- Severe sleep deprivation is significantly affecting your mental health — this deserves support
Key Takeaway
There is no single age at which babies “should” sleep through the night. Longer stretches emerge gradually as the stomach grows, the circadian rhythm matures, and sleep associations evolve. Most babies make meaningful progress between 3 and 6 months — but the timeline varies widely, and frequent waking well beyond 6 months is still within the normal range.
Parents Also Ask
- Is It Normal for a Newborn to Wake Every Hour Overnight?
- How Do I Help My Baby Settle Between Sleep Cycles?
- What Are Wake Windows?
This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your pediatrician or a qualified healthcare provider with questions about your baby’s health.