Baby Sleep Schedule Calculator

Does this tool calculate anything, or is it a lookup?

It is a lookup. You enter an age in months and the tool picks one of nine age bands, then prints that band’s fixed values for total sleep, night sleep, nap count, nap length, wake window and bedtime window. There is no arithmetic on your child’s own sleep, and nothing you type besides age changes the output.

Which age bands does it use?

The bands end at 1, 3, 5, 8, 11, 17, 23 and 35 months, and everything from 36 months up falls into the last band. In the tool’s labels they read 0–1, 2–3, 4–5, 6–8, 9–11, 12–17, 18–23, 24–35 months and 3+ years. A value such as 1.5 months falls in the 2–3 month band because it is above 1.

Where do the numbers come from?

The tool’s formula line cites the American Academy of Pediatrics ranges for total daily sleep by broad age group. The nap counts, nap durations, wake windows and bedtime windows are the tool’s own fixed table, and the tool does not cite a source for them. Treat them as general planning figures rather than a clinical standard.

Why does the number of naps change so suddenly?

Because each band has a single fixed nap count, the output changes in steps. At 8 months the tool shows 3 naps, at 9 months it shows 2, at 12 months still 2, at 18 months 1, and from 36 months none. A real child moves between nap patterns gradually, so the step at a band edge does not mean something changes overnight.

Does it give clock times for naps?

No. It gives a count, a typical length range and a wake-window range. The only clock times are the suggested bedtime window, such as 6:30 PM – 7:30 PM for most ages between 6 and 35 months. You work out the nap timing yourself from the wake window.

Does it adjust for a premature baby or corrected age?

No. It uses exactly the age in months you enter, with no correction for early birth. If your pediatrician has suggested using a corrected age, enter that age yourself, and ask them how the ranges apply to your child.

Is this safe-sleep guidance?

No. The tool contains no safe-sleep advice, and nothing it displays should replace guidance from your pediatrician or local health authority about where and how a baby sleeps. Discuss any concern about your child’s sleep, feeding or alertness with a pediatric professional.

What happens for toddlers over 3 or for invalid ages?

Any age of 36 months or more returns the last band: 10–13 hours of total sleep, 10–11 hours at night, no nap row and bedtime 7:00 PM – 8:30 PM. There is no upper age limit, so an age of 120 months gets the same output. A negative age is treated as 0, and clearing the box also gives 0, which returns the youngest band (14–17 hours of total sleep, 8–9 hours at night, 4 naps).