Newborn sleep varies widely; many newborns sleep around 16 to 17 hours across a full day, but almost never in one stretch. From 4 months onward, evidence-based sleep ranges become more specific. Here's what is typical at each stage, and how to tell a normal short nap from a baby who's overtired.
Note: These are general ranges, not targets to hit exactly. Every baby's sleep needs vary. If you're worried about your baby's sleep, breathing, or development, talk to your pediatrician.
Sleep Needs by Age
| Age | Total sleep per day |
|---|---|
| Newborn (0–3 months) | Varies widely; often around 16–17 hours |
| Infant (4–11 months) | 12–16 hours |
| Toddler (1–2 years) | 11–14 hours |
These totals include naps. A newborn's day is essentially a series of 2–4 hour sleep/wake cycles around the clock, not a single overnight block plus naps.
Why Newborns Sleep in Such Short Stretches
Newborns haven't developed a circadian rhythm yet - the internal clock that eventually links sleep to daylight and darkness. Combined with a small stomach that needs refilling every few hours, that means frequent waking is normal, not a sign anything is wrong. Most babies start consolidating longer stretches of nighttime sleep somewhere between 3 and 6 months, though the exact timing varies a lot from baby to baby.
Signs Your Baby Is Overtired vs. Well-Rested
An overtired baby often becomes harder to settle, not easier. Common signs include:
- Fussing or crying that escalates instead of settling
- Rubbing eyes, yawning, or staring blankly ("glazed" look)
- Arching the back or turning away during feeds
- Difficulty falling asleep despite clearly being tired
A well-rested baby, by contrast, usually wakes up calm, feeds well, and has predictable awake windows before the next signs of tiredness appear. Watching for the early tired cues - rather than waiting for overtired ones - makes settling noticeably easier.
How Tracking Sleep Helps You Spot Patterns
In the moment, it's genuinely hard to remember whether the last nap was 40 minutes or 90, or whether today's pattern is unusual or completely normal for your baby. Logging sleep and nap times turns a vague sense of "she seems tired again already" into an actual pattern you can see - which is exactly what a wake-window or schedule tool needs to be useful.
Frequently Asked Questions
How many hours of sleep does a newborn need per day?
Newborn sleep varies widely, but many newborns sleep around 16 to 17 hours a day in total, spread across many short stretches rather than one long block.
When do babies start sleeping through the night?
Most babies begin consolidating longer nighttime stretches somewhere between 3 and 6 months, though the exact timing varies a lot from baby to baby.
Is it normal for a newborn to wake up every 2 hours?
Yes. Newborns haven't developed a day/night rhythm yet and have small stomachs that need refilling often, so waking every 2 to 4 hours is expected.
Sources
This guide was fact-checked against the following guidance on July 14, 2026:
Related Reading
Milli's Sleep Helper
Milli logs every sleep and nap with one tap, and its Sleep Helper uses your baby's age to suggest wake windows and a nap/bedtime schedule - built from the same tracking data your family already keeps in one shared timeline.