Improved UI.

Have added calculations for the classical Tanner mid-parental height formula to the “Mid-parental | Target Height” screen.

Updated Privacy Policy. Have added the ability to calculate the eGFR (using the iCARES formula) for children 10–18 years of age with BMI ≥85th centile on the “Obesity” screen.

Updated Privacy Policy. Have added the ability to calculate the eGFR (using the iCARES formula) for children 10–18 years of age with BMI ≥85th centile on the “Obesity” screen.

Updated Privacy Policy. Have added the ability to calculate the eGFR (using the iCARES formula) for children 10–18 years of age with BMI ≥85th centile on the “Obesity” screen.

Improved age calculation.

Have added new growth charts for boys with Klinefelter syndrome from Davis SM, et al. Pediatrics 2025;156(6):e2025072193. Some UI improvements.

Have added the ability to enter age either with dates or directly to all screens. Improved UI and speed. Updated copyright.

On the “CDC” screen, have added “gradual Z-scores” for height, weight and BMI for children 2–5 years, which smooth the transition from WHO values back to CDC [Pediatrics 2025;156(3):e2025070697)]; this can be switched on and off on the “Settings” screen. Have added the ability to directly enter the age (years, months and days) on the “WHO” and “CDC” screens, instead of having to enter date of birth and date of measurement (which is still the default). Have made some calculation speed enhancements in “WHO,” “CDC,” and “Predicted Adult Height” screens.

On the “CDC” screen, have added “gradual Z-scores” for height, weight and BMI for children 2–5 years, which smooth the transition from WHO values back to CDC [Pediatrics 2025;156(3):e2025070697)]; this can be switched on and off on the “Settings” screen. Have added the ability to directly enter the age (years, months and days) on the “WHO” and “CDC” screens, instead of having to enter date of birth and date of measurement (which is still the default). Have made some calculation speed enhancements in “WHO,” “CDC,” and “Predicted Adult Height” screens.

On the “CDC” screen, have added “gradual Z-scores” for height, weight and BMI for children 2–5 years, which smooth the transition from WHO values back to CDC [Pediatrics 2025;156(3):e2025070697)]; this can be switched on and off on the “Settings” screen. Have added the ability to directly enter the age (years, months and days) on the “WHO” and “CDC” screens, instead of having to enter date of birth and date of measurement (which is still the default). Will continue to do this on other screens with time. Have made some small bug fixes in “Predicted Adult Height” screen.

On the “CDC” screen, have added “gradual Z-scores” for height, weight and BMI for children 2–5 years, which smooth the transition from WHO values back to CDC [Pediatrics 2025;156(3):e2025070697)]; this can be switched on and off on the “Settings” screen. Have added the ability to directly enter the age (years, months and days) on the “WHO” and “CDC” screens, instead of having to enter date of birth and date of measurement (which is still the default). Will continue to do this on other screens with time. Have made some small bug fixes in “Predicted Adult Height” screen.

On the “CDC” screen, have added “gradual Z-scores” for height, weight and BMI for children 2–5 years, which smooth the transition from WHO values back to CDC [Pediatrics 2025;156(3):e2025070697)]; this can be switched on and off on the “Settings” screen. Have added the ability to directly enter the age (years, months and days) on the “WHO” and “CDC” screens, instead of having to enter date of birth and date of measurement (which is still the default). Will continue to do this on other screens with time. Have made some small bug fixes in “Predicted Adult Height” screen.

On the “CDC” screen, have added “gradual Z-scores” for height, weight and BMI for children 2–5 years, which smooth the transition from WHO values back to CDC [Pediatrics 2025;156(3):e2025070697)]; this can be switched on and off on the “Settings” screen. Minor improvement tweaks.

On the “CDC” screen, have added “gradual Z-scores” for height, weight and BMI for children 2–5 years, which smooth the transition from WHO values back to CDC [Pediatrics 2025;156(3):e2025070697)]; this can be switched on and off on the “Settings” screen. Minor improvement tweaks.

Have added the 2025 (third-generation) Fenton Preterm Growth Charts and fixed minor calculation bugs for several screens.

Have added the 2025 (third-generation) Fenton Preterm Growth Charts and fixed minor calculation bugs for several screens.

Have added the 2025 (third-generation) Fenton Preterm Growth Charts and fixed a minor calculation bug for this.

Have added the 2025 (third-generation) Fenton Preterm Growth Charts and fixed a minor calculation big for this.

Have added the 2025 (third-generation) Fenton Preterm Growth Charts.

Have added the 2025 (third-generation) Fenton Preterm Growth Charts.

Updated support website.

Have improved readability and uniform appearance of screens. Minor bug fixes. Now remembers choice of exact or direct gestational age input on the premature infant screens from previous session.

Updated copyright.

Updated terms.