This version was machine-translated from German and has not been medically reviewed. The authoritative version is the German version.

Weight gain, general

g/day, g/week and g/kg/day from two weighings – for infants and children outside the Fenton curve

Child

Sex

male female

Date of birth

For classification on the reference; without a date of birth, only the growth rate is calculated.

Gestational age at birth (weeks, in preterm infants)

If entered, the corrected age is used up to a chronological age of 24 months (age minus the weeks remaining to the due date at 40 weeks of gestation); after that, the chronological age.

Measurements

Date of measurement 1

Weight at measurement 1 (kg)

Date of measurement 2

Weight at measurement 2 (kg)

Reference

Calculation aid for healthcare professionals: the calculator reproduces what the sources cited assign to the inputs. Clinical assessment and every treatment decision remain with the treating physician. Inputs and results are not stored.

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Sources

Accuracy of methods for calculating postnatal growth velocity for extremely low birth weight infants (Pediatrics 116:1466–1473) Patel AL, Engstrom JL, Meier PP, Kimura RE, 2005. Original paper (exponential method for g/kg/day)
WHO Child Growth Standards: Growth velocity based on weight, length and head circumference – Methods and development WHO Multicentre Growth Reference Study Group, 2009. Reference work (freely accessible)

Related calculators

Note

Calculation aid for healthcare professionals. Clinical assessment remains with the treating physician.

Review date of the German original: 2026-11-05 · Methodology

For parents (in German): Percentile calculator (kinderarzt.net)

Frequently asked questions

Weight gain, general: What does this calculator compute?

Calculates weight gain between two weighings in g/day, g/week and g/kg/day (exponential method according to Patel 2005, validated in preterm infants under 1000 g) and compares it with the gain expected by the selected reference (WHO, CDC, Kromeyer-Hauschild, KiGGS) over the same age interval.

Weight gain, general: Which sources is this calculator based on?

Patel AL, Engstrom JL, Meier PP, Kimura RE: Accuracy of methods for calculating postnatal growth velocity for extremely low birth weight infants (Pediatrics 116:1466–1473) (2005); WHO Multicentre Growth Reference Study Group: WHO Child Growth Standards: Growth velocity based on weight, length and head circumference – Methods and development (2009)