Baby Sleep Schedule Calculator
The time your baby typically wakes up in the morning
Your desired bedtime — the calculator will adjust wake windows to reach it
Override to test different nap scenarios (e.g., 2 naps vs. 3 naps)
If your baby was born before 37 weeks, check this box to base the schedule on their corrected developmental age
Your Baby's Schedule Will Appear Here
Adjust the age slider and wake time above to instantly generate a personalized nap and bedtime schedule.
How to Use This Calculator
Set Your Baby's Age
Drag the age slider to your baby's current age in months (0–36). The calculator automatically loads the age-appropriate nap count, wake windows, and sleep targets. If your baby was born premature, check the 'Born premature' box and enter gestational weeks to use their corrected developmental age.
Enter Wake and Bedtime
Select your baby's typical morning wake-up time from the dropdown (available in 15-minute increments). Then choose your target bedtime. The calculator will adjust wake windows within the age-appropriate range to get as close to your target bedtime as possible.
Review the Generated Schedule
The schedule card shows each event (wake up, nap 1 start/end, nap 2 start/end, bedtime) with exact clock times and durations. Wake windows between each sleep period are shown so you can track how long your baby has been awake. The 24-hour timeline bar provides an at-a-glance view of the full day.
Export or Print Your Schedule
Use the 'Export CSV' button to download the schedule as a spreadsheet you can share or edit. Use 'Print Schedule' to get a print-friendly version for your fridge or caregiver. Try overriding the nap count to compare a 2-nap versus 3-nap scenario if your baby is near a transition age.
Frequently Asked Questions
What is a wake window and why does it matter?
A wake window is the amount of time your baby can comfortably stay awake between sleep periods before becoming overtired. Wake windows are specific to your baby's age and grow progressively as they develop. Keeping your baby within the appropriate wake window range makes it much easier for them to fall asleep and stay asleep, because their sleep pressure is at the right level without tipping into overtiredness. When babies become overtired, cortisol and adrenaline enter their system, making settling much harder and often leading to more fragmented night sleep — the opposite of what most parents expect. This calculator uses clinically referenced wake windows for each month of age, giving you the ideal timing for each nap and bedtime.
At what age should I start following a sleep schedule?
Most pediatric sleep experts recommend waiting until around 2–3 months before introducing a clock-based schedule. Before this age, feeding on demand and responding to sleep cues are more developmentally appropriate because newborns lack the circadian rhythm needed to follow predictable patterns. Around 6–8 weeks, you can begin introducing a loose routine based on wake windows. By 3–4 months, most babies are developmentally ready for a more structured schedule with consistent nap times and a bedtime routine. Starting a schedule too early can interfere with milk supply if breastfeeding and may cause unnecessary stress for both parent and baby.
Why does my baby's scheduled bedtime seem so early?
Early bedtimes — between 6:30 PM and 8:00 PM for most babies aged 4–18 months — are consistently recommended by pediatric sleep research because they align with the biological window when melatonin production and sleep pressure are both naturally high. A bedtime that seems 'too early' to adults is often precisely right for a baby. Counter-intuitively, earlier bedtimes are associated with later morning wake times and longer overall sleep, while late bedtimes are correlated with overtiredness, more frequent night wakings, and earlier morning rises. During nap transitions, temporarily moving bedtime even earlier (by 30–60 minutes) for a few weeks can make a significant difference.
What are the signs my baby is ready to drop a nap?
Signs that a nap transition is approaching include: consistently taking 45+ minutes to fall asleep for the nap you are considering dropping; resisting that nap entirely on most days; waking significantly earlier in the morning despite no other changes; nighttime sleep becoming more fragmented; or the nap in question cutting into the following wake window so severely that it pushes the next nap or bedtime too late. It is important not to drop a nap prematurely during a temporary nap strike (common around 4 months, 8 months, and 18 months), which usually resolves within 2–4 weeks without schedule changes.
What should I do if my baby's actual sleep doesn't match the schedule?
Some variation from the generated schedule is normal and expected. Real babies are affected by hunger, growth spurts, teething, illness, overstimulation, and developmental milestones that temporarily override ideal sleep timing. A good rule of thumb is to use the schedule as a target, not a rigid rule. If your baby wakes early from a nap, cap the total awake time after that nap to avoid overtiredness snowballing through the day. If bedtime shifts consistently, adjust the schedule's starting wake time or nap timing slightly. If sleep has been disrupted for more than two weeks without an obvious cause (teething, illness, travel), consulting a certified pediatric sleep consultant can help identify and resolve the underlying issue.
How do I use this calculator for a premature baby?
Premature babies should have their sleep schedules based on their corrected age — also called adjusted age — rather than their chronological age from birth. Corrected age is calculated by subtracting the number of weeks born early from the chronological age. For example, a baby born 8 weeks early (32 weeks gestation) who is now 4 months old has a corrected age of approximately 2 months. This calculator includes a 'Born premature' option where you enter the gestational age at birth, and it automatically calculates the corrected age for all sleep recommendations. Most sleep experts recommend using corrected age for sleep schedules until the baby reaches 12–18 months of chronological age.