What is a wake window?

The time a baby can comfortably stay awake between sleeps. This tool estimates it by age and generates a printable day schedule.

Free tool · No signup · Photos & logs stay in your browser (localStorage)

Twins + Preemie Wake Window Calculator

Enter age → get wake windows, nap count, sample schedule + printable. For reference only, not medical advice — follow your pediatrician and safe-sleep guidance.

1 · Age + twins + preemie

Twins mode Born early (weeks) Chronological age (months)

Corrected age = chronological − weeks early (use until ~2.5y for milestones; vaccines follow birth age). Twins: keep one page for both lanes so caregivers see overlap.

Age preset (auto from corrected age)

Age preset Wake-up time Bedtime goal

2 · Your day plan

Tip: if naps are short 3 days in a row, lengthen wake window by 15 min. Sources: pediatric sleep guidance + Huckleberry/Nanit averages (see methodology below).

3 · Nap log (today, local only)

Note‎

4 · Daycare handoff (print)

Twins tip: sync without forcing; after 6 months prefer clock-based naps over strict windows.

Methodology + FAQ

Ranges compiled from pediatric references and popular tracker averages; every family differs. This page is informational, not medical advice. Keywords: wake window calculator, baby sleep schedule by age, nap chart printable.