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

INTERGROWTH-21st growth chart for preterm infants (follow-up)

Multiple measurement points of a preterm infant on the INTERGROWTH-21st postnatal curves

Child

Sex

male female

Date of birth

Gestational age at birth

Measurements

Date	Weight (g)	Length (supine) (cm)	Head circumference (cm)

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About this calculator

Several measurement points of a preterm infant (weight, length, head circumference) on the INTERGROWTH-21st charts for postnatal growth (27–64 weeks postmenstrual), with z-score course and weight gain between measurements.

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Reference and license

INTERGROWTH-21st Postnatal – 27–64 weeks postmenstrual.
Villar J, Giuliani F, Bhutta ZA, et al. Postnatal growth standards for preterm infants: the Preterm Postnatal Follow-up Study of the INTERGROWTH-21st Project. Lancet Glob Health. 2015;3(11):e681–e691. License: terms of use of the INTERGROWTH-21st data not clarified (portal intergrowth21.com public and free of charge; whether use in a calculator is permitted is not documented). Coefficients from the R package gigs (LSHTM, github.com/lshtm-gigs/gigs); its GPL ≥ 3 license applies to the R code, not to the data. Only the calculation has been reproduced here, no code adopted. Source
Standard for preterm infants (born under 37+0 weeks) without severe illness, for the course after birth up to 64 weeks postmenstrual; thereafter WHO curves with corrected age. Not for classification at birth.

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Note

Calculation aid for healthcare professionals. Percentiles and z-scores describe the position of a measured value in the reference population; clinical assessment remains with the treating physician.

Review date of the German original: 2026-11-08 · Methodology

Frequently asked questions

INTERGROWTH-21st growth chart for preterm infants (follow-up): What does this calculator compute?

INTERGROWTH-21st growth chart for preterm infants (follow-up): What sources is this calculator based on?

Villar J, Giuliani F, Bhutta ZA, et al. Postnatal growth standards for preterm infants: the Preterm Postnatal Follow-up Study of the INTERGROWTH-21st Project. Lancet Glob Health. 2015;3(11):e681–e691.