Tools
Free tools
Small, browser-only tools for tracking two babies. Nothing you enter is sent anywhere.
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Wake window calculator
Enter your baby's age and last wake time to see the next nap window.
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Twin nap overlap finder
Enter both twins' wake times to find the window where both are asleep at once.
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Twin sleep schedule builder
Pick an age and wake time to get a sample day of naps and bedtime for both twins.
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Bedtime calculator
Enter the last wake of the day to get a suggested bedtime window.
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Twin weight discordance
The NICE formula for the weight difference between twins, and what the 20% and 25% thresholds mean.
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Sleep needs by age
See typical total sleep, naps and night sleep for your baby's age.
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Night shift splitter
Turn a broken night into two unbroken blocks, and see what splitting by time saves over splitting by baby.
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Feeding amount calculator
Estimate a rough daily and per-feed formula amount from your baby's weight.
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Corrected age calculator
Enter birth date and due date to get your baby's actual and corrected age.
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Weight-for-age checker
See how your baby's weight compares to the WHO average for their age.
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Wet nappy checker
See how many wet nappies a day to expect for your baby's age.
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Due date calculator
Estimate your due date from the first day of your last period.
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Ovulation calculator
Estimate your ovulation day and fertile window from your cycle.
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Pregnancy week calculator
Enter your due date to see how far along you are and days to go.
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Weeks to months converter
Turn any pregnancy week into the month and trimester it falls in.
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Baby age converter
Weeks, months and days from a date of birth, with corrected age for premature babies.
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