Down Syndrome Growth (Zemel)
Computes weight and length/height z-score and percentile using the Down syndrome–specific Zemel 2015 reference (infant 0–36 mo, child 2–20 y, sex-specific). Does not replace standard charts. Informational only.
This tool uses a Down syndrome–specific reference; it complements, and does not replace, standard (general-population) growth charts. Informational only; it does not diagnose. The trend matters more than one point, and assessment is done by a clinician alongside the child’s overall health.
Frequently asked questions
Why a Down syndrome–specific chart?
Children with Down syndrome grow differently from the general population and can look incorrectly “very short/underweight” on standard charts. Syndrome-specific references like Zemel 2015 compare the child to their own group for a fairer, more meaningful assessment.
Does it replace standard charts?
No. It complements standard charts. Clinicians usually review both. Co-occurring thyroid, cardiac or nutrition issues can affect growth.
Which measurements can I enter?
Infants (0–36 mo): weight and length; children (2–20 y): weight and height. Weight in g or kg, length/height in cm. Output is a sex-specific z-score and percentile.
Is a low percentile a problem?
The trend matters more than a single point. Following the child’s own curve is the most reassuring sign. A marked, persistent deviation should be reviewed with a paediatrician/endocrinologist.