By age · Infant (4–11 mo)

How much sleep do infants (4–11 months) need?

Around month 4, infants begin to consolidate night sleep. Most settle into a 1–2 nap daytime pattern.

Recommended

12–15 hrs

Cycles per night

8–10

Source

National Sleep Foundation 2015

Developmental context

Infants (4–11 months) have a maturing circadian rhythm and begin to consolidate night sleep. Total sleep typically runs 12–16 hours per 24 hours, with night sleep starting to dominate. Most infants drop from 3–4 daytime naps at 4 months to 2 longer naps by 9 months. The 4-month sleep regression — actually a permanent maturation rather than a regression — marks the shift to adult-like sleep architecture with full sleep cycles.

Sleep architecture at this age

Infant sleep cycles lengthen to about 60–90 minutes during this band. The proportion of active (REM-precursor) sleep drops from 50% toward adult levels. By 6 months, most infants are biologically capable of 6+ hour consolidated night sleep — though many still wake from habit or hunger.

Common problems and patterns

4-month sleep regression — sleep cycles mature, infants enter brief wakefulness between cycles and may need help relinking. Treat as a developmental milestone, not a problem.
Catnaps (30–45 minutes) common at 4–6 months; consolidate to 60–90 minute naps by 8–10 months.
Separation anxiety peaks around 8–10 months and can disrupt previously consolidated sleep.

Evidence-based strategies

Establish a consistent bedtime routine starting around 4 months — bath, dim lights, feed, song, sleep. The order matters less than the consistency.
Move the infant to their own sleep space (room-sharing per AAP recommendation, not bed-sharing) by 4–6 months.
Teach independent sleep onset around 4–6 months — falling asleep in the cot rather than on the breast or bottle. Reduces between-cycle wakings later.
Daytime nap schedule generally: 4 months 4 naps; 6 months 3 naps; 9 months 2 naps. Transitions take 1–2 weeks of irritability.

Frequently asked questions

How much sleep does a 6-month-old need?

12 to 15 hours per 24 hours, typically 10–11 hours at night plus 2–3 hours across naps. Individual variation is substantial; trends matter more than single days.

What is the 4-month sleep regression?

Sleep cycles mature into adult structure with brief micro-arousals between cycles. Infants who could not previously transition without help now wake fully at these arousals. It is permanent — sleep is now adult-architecture and skills need to be taught.

Should a 9-month-old still nap?

Yes, two naps is the typical pattern at 9 months — usually a mid-morning and an early-afternoon nap totalling 2–3 hours. Dropping to one nap is more typical around 14–18 months.

What this means in practice

The 12–15 hour range is the consensus from large meta-analyses, not a strict cutoff. Individuals at the edges of the band are usually fine. Chronic sleep below the lower bound is where measurable harm appears in cognitive, metabolic, and immune endpoints.

Use the sleep calculator to translate the recommended hours into a bedtime that ends a full 90-minute cycle.