What is catch-up growth?

Catch-up growth is the accelerated rate of weight or height gain a child exhibits after a period of growth faltering (undernutrition, illness, or other insult). To "catch up" to the target percentile, the child must gain weight faster than a healthy peer of the same age.

How is Ideal Body Weight estimated in this tool?

This tool uses WHO Child Growth Standards median weights (50th percentile reference values) adjusted for the selected target percentile using approximate z-score scaling. For clinical precision, consult official WHO weight-for-age tables.

What is a realistic maximum catch-up velocity?

During therapeutic feeding, children with severe acute malnutrition can gain 10–20 g/kg/day. In community-based programs, 5–10 g/kg/day is more typical. Velocities above 20 g/kg/day are unusual and should prompt re-evaluation of measurements.

What does g/kg/day mean?

Grams gained per kilogram of current body weight per day. This normalizes the velocity to body size and is the standard metric in pediatric nutrition and therapeutic feeding protocols.

Can this tool be used for height/length catch-up?

This version focuses on weight catch-up. Height catch-up (linear growth) depends on adequate protein, micronutrients, and a longer timeline — it is calculated separately using height velocity references.

Is the result a feeding prescription?

No. This tool provides an educational estimate of required velocity. Actual feeding plans must account for the child's clinical condition, appetite, underlying diagnosis, and energy requirements. Always involve a pediatrician or registered dietitian.

Catch-Up Growth Calculator

Name: Catch-Up Growth Calculator
Availability: InStock
Author: Nham Vu

Enter a child's age, sex, current measurements, and target percentile to get the required catch-up growth velocity in g/day and g/week.

Child Parameters

Sex

Age (months, 0–60)

Current Weight

Target Percentile

Catch-Up Window (weeks)

Time allowed to reach target weight (1–104 weeks)

Educational reference only. These estimates do not constitute a feeding prescription. Always verify catch-up targets and feeding plans with a licensed pediatrician or registered dietitian. Individual clinical factors — diagnosis, appetite, comorbidities — must be assessed by a qualified provider.

Enter child parameters and click Calculate

Summary

Enter a child's age, sex, current measurements, and target percentile to get the required catch-up growth velocity in g/day and g/week.

How it works

Enter the child's age (0–60 months), sex, and current weight.
Select a target percentile (typically 50th or the child's original tracking percentile).
Enter the desired catch-up window — how many weeks you want the child to reach the target.
The tool looks up the WHO median weight for the child's age and sex to estimate Ideal Body Weight at the target percentile.
Weight deficit is computed as IBW minus current weight.
Required velocity is deficit divided by the catch-up window, expressed in g/day and g/kg/day.

Use cases

Estimate catch-up nutrition targets for a child with moderate or severe acute malnutrition.
Set weekly weight-gain goals during outpatient therapeutic feeding programs.
Monitor whether a stunted infant is on track to reach the target weight after starting supplementation.
Educate caregivers on the daily weight gain needed to close an existing deficit.
Provide a quantitative catch-up target for pediatric dietitians writing nutrition care plans.
Screen infants in growth faltering clinics by comparing required velocity to published feasible rates.

Frequently Asked Questions

Last updated: 2026-07-22 · Reviewed by Nham Vu