4-month-old nap schedule: wake windows, naps, and the regression

By the HAL team · Updated August 27, 2026

Four months is when a schedule first becomes worth talking about. Sleep is reorganizing into adult-style cycles, the body clock is coming online, and most babies land on 3–4 naps with wake windows of roughly 75 minutes to 2 hours.

The shape of the day

• Wake windows: about 75 min–2 h, shortest before the first nap, longest before bedtime.
• Naps: 3–4, often one or two decent naps plus catnaps. Total day sleep commonly 3.5–4.5 hours.
• Night: 10–12 hours with feeds; the AASM's 12–16 h per 24 h recommendation starts at this age.

Sample 4-month day

A shape, not a script — anchor to your baby's actual wake-up and the day flexes from there.

The 4-month sleep regression, briefly

It isn't really a regression — the underlying change is a permanent upgrade, even though the rough patch it causes is temporary. Around 3–5 months, baby's sleep matures into cycles with more light-sleep stages, which means more chances to fully wake between cycles. A baby who needs help falling asleep at bedtime will often need the same help at every overnight cycle break. It typically shows up as sudden frequent night waking and short naps lasting anywhere from a few days to a few weeks (some babies take up to six). What helps: protecting age-appropriate wake windows, practicing some falling-asleep-in-the-crib at bedtime, and riding it out consistently.

Questions parents ask at this age

How much should a 4-month-old sleep? The formal guidance (AASM, endorsed by the AAP) is 12–16 hours per 24 including naps — commonly ~10–12 hours at night plus 3.5–4.5 hours across naps.

Can a 4-month-old sleep through the night? Some manage one long stretch of 6–8 hours; many still genuinely need a night feed or two. Both are normal at this age — ask your pediatrician about your baby specifically before dropping night feeds.

What's a good bedtime for a 4-month-old? Most land between 6:30 and 7:30 PM — roughly 2 hours after the last nap ends. If the last nap ran late, bedtime shifts with it.

Can a 4-month-old nap too long? A single marathon nap that eats the day's sleep pressure can shortchange the night. Many families cap daytime naps around 2 hours; if nights are going fine, there's no need to wake a napper.

Should I move bedtime earlier if a nap gets skipped? Yes — an earlier bedtime (commonly 30–60 minutes, rarely before 6:00 PM) is the standard bridge that keeps a lost nap from snowballing into an overtired night.

Keeping two parents on the same day

At 3–4 naps a day, timing drifts fast — a 20-minute-late nap moves everything behind it. This is the age where households start needing a shared record. In HAL's case that's your existing group chat: "woke 7:05" from whoever got up, and everyone sees the same schedule and the same next-nap window estimate, sized to your baby's own recent rhythm rather than a generic chart.