Journal
WHO growth charts: reference curves, not a verdict
Understand the distinction between a recorded measurement, a reference curve and an app estimate.
Where the reference comes from
WHO’s child growth standards describe growth from birth to five years under specified favourable conditions. They draw on a multicountry study and include separate indicators for different measurements. [1]
What Baby Track adds
Baby Track contains WHO reference data for weight, length or height, and head circumference. The app interpolates between reference ages and calculates approximate standard-deviation scores. It is important to distinguish these app calculations from the original WHO tables: the app is not an official WHO assessment service.
A chart is one part of an assessment
CDC states that growth charts are not intended to be a standalone diagnostic tool. Clinical interpretation includes more than the position of a point on a curve. [2]
Keep measurement and estimate distinct
When you enter a measurement, use its actual date and check the units. If you are looking at a projected value, remember that no measurement took place on that future date. Ask your care team which chart and age basis are appropriate for your child, rather than changing feeding to follow an app curve.