Weight, length and head circumference compared against official WHO curves, by age and sex.
The WHO Child Growth Standards (2006) describe how infants grow under favorable environmental conditions (breastfeeding, no maternal smoking, good socioeconomic conditions), based on data from over 8,000 children across six countries. Each percentile curve is generated with the LMS method: L is the Box-Cox power that corrects skewness in the distribution, M is the expected median for the age and sex, and S is the coefficient of variation. From L, M and S you can compute the exact z-score of any measurement, and convert that z-score into a percentile. This calculator uses the official WHO parameters at 25 monthly ages (0 to 24 months) and interpolates between them for in-between ages.
Paste the code into your HTML and the tool shows up on your page, without J-Kit's navigation and ads. It still runs in the browser of whoever visits your site.
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src="https://jkit.tools/embed/en-US/child-growth-chart"
width="100%"
height="600"
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title="Child Growth Chart (0-24 Months)"
></iframe>These references help contextualize formulas, standards, APIs and limitations used on this page. They do not replace professional validation when a result has legal, financial, medical or operational impact.
It means that, among 100 babies of the same sex and age in the WHO reference population, about 60 have a value equal to or lower, and 40 have a higher value. It is not a score from 0 to 100: a baby in the 15th percentile can be perfectly healthy, just smaller than most babies of the same age.
Medical notice: this calculator is educational, based on the WHO growth standards, and does not replace a pediatrician's assessment. A single point outside the typical range is not a diagnosis; what matters clinically is the trend over time.
The data you enter stays only in your browser. We do not save or send these measurements anywhere.