This version was machine-translated from German and has not been medically reviewed. The authoritative version is the German version.
WHO 0–24 months
Weight, length, head circumference and weight-for-length according to WHO 2006
About this calculator
Percentiles and z-score (SDS) for weight-for-age, length-for-age, head-circumference-for-age and weight-for-length according to the WHO Child Growth Standards, 0–24 months. For preterm infants, age is corrected until month 24.
In preterm infants, if a gestational age is given, age is corrected up to month 24 of life for the missing weeks up to 40+0. The z-score (SDS) describes the deviation from the median in standard deviations; the percentile the proportion of the reference population with a smaller value.
Frequently asked questions
What does the percentile mean?
The percentile indicates what percentage of healthy reference children of the same age and sex have a smaller value. A weight at P25 is therefore greater than that of 25 % of reference children – this is the normal range, not a deviation.
What is the z-score (SDS)?
The z-score describes the deviation from the median in standard deviations. 0 is the median, −2 corresponds to about P2.3, +2 to P97.7. The WHO defines underweight or stunting from −2 SD and severe forms from −3 SD.
Why is age corrected in preterm infants?
A child born too early is assessed against its corrected age (chronological age minus the time missing until 40+0 weeks) until month 24 of life, because it catches up in growth from the due date. The calculator corrects automatically if a gestational age is given.
How do the WHO standard and the German reference differ?
The WHO Child Growth Standards describe how breastfed children grow under good conditions (standard). Kromeyer-Hauschild and KiGGS describe how children in Germany have actually grown (reference). Both are available in the portal.