The Short Answer
Most babies begin sleeping through the night (a stretch of 6–8 hours without waking) somewhere between 4 and 6 months of age, but there is significant individual variation — and "sleeping through" rarely means 12 uninterrupted hours at first.
What "Sleeping Through the Night" Actually Means
Parents often expect a full 8–10 hour stretch, but pediatric sleep experts define "sleeping through the night" more modestly:
- 0–3 months: Normal sleep is 2–3 hour stretches; waking to feed every 2–3 hours is biologically expected
- 4–6 months: Many infants consolidate sleep into one 5–6 hour stretch, typically in the early part of the night
- 6–9 months: Around 70–80% of babies sleep 6+ hours without waking by 6 months, according to AAP-aligned research
- 9–12 months: Most healthy babies can sleep 9–11 hours with one brief wake at most
Key Factors That Influence Sleep Consolidation
- Weight and feeding: Babies who have reached approximately 5–6 kg (11–13 lbs) often have the stomach capacity to go longer between feeds
- Breastfed vs. formula-fed: Breastfed babies tend to wake more often because breast milk digests faster — this is normal and not a sign of a problem
- Developmental stage: Brain development milestones (rolling, teething, separation anxiety) regularly disrupt sleep even in previously "good" sleepers
- Sleep environment: A safe, dark, quiet room with consistent bedtime routine supports longer sleep
- Individual temperament: Some babies naturally consolidate sleep later, this does not indicate a parenting failure
What the Research Says
The American Academy of Pediatrics (AAP) notes that night wakings are a normal developmental feature of infancy. The WHO does not set a benchmark for when babies "should" sleep through, emphasising that night feeding supports adequate nutrition, especially for breastfed infants.
The AAP and WHO both recommend on-demand feeding in the first months regardless of clock time, prioritising nutrition and attachment over sleep schedules.
When to Talk to Your Doctor
- Your baby is over 6 months and waking more than 4–5 times per night every single night
- Waking is accompanied by breathing irregularities, excessive snoring, or apparent distress
- Your baby was sleeping longer but suddenly regressed severely after 9 months
Practical Tips
- Establish a consistent bedtime routine from 6–8 weeks (bath, feed, song, dark room)
- Put baby down drowsy but awake to encourage self-settling
- Avoid rushing in at every tiny sound, give baby 2–3 minutes to resettle
- Use our Baby Sleep Tracker to log patterns and spot natural consolidation
Sources
- American Academy of Pediatrics (AAP), Safe Sleep Recommendations
- World Health Organization (WHO), Infant and Young Child Feeding
- NHS, Sleep and your baby
- Mayo Clinic, Infant and toddler health: Sleep
🔧 Helpful Tools
- Baby Sleep Tracker — Track and optimize your baby's sleep
- Baby Food Guide — Safe foods and introduction schedule for your baby
- All Baby Tools — Browse all free tools for pregnancy and baby care
📖 Related Articles
- How Much Sleep Does a Newborn Need? — Newborns need 14–17 hours of sleep per day, spread across multiple short stretches. Learn what's normal, what's not, and how to support healthy newborn sleep.
- What Is a Wake Window for Babies? — A wake window is the ideal amount of time a baby can stay awake between sleeps without becoming overtired. Learn wake windows by age and how to use them to improve sleep.
- How to Help Your Baby Sleep Longer Stretches — Evidence-based strategies to help babies sleep longer, including optimising wake windows, bedtime routines, sleep environment, and gentle self-settling techniques.
