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Use the same profile as the official chart used for review.
Format: age_months,height_cm,weight_kg. Enter 2–30 visits for one child.
Major lanes use the 3rd, 15th, 50th, 85th, and 97th percentile markers.
bands
Accepted range: 85th–99th percentile.
percentile
Accepted range: 2–10 cm/year. Confirm concerns with age-specific clinical guidance.
cm/year
This changes chart annotation only; the report calculation remains unchanged.
Growth guidance
Current review cue

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Measurement check

Confirm ages, units, measurement technique, and the WHO-to-CDC handoff before interpreting a sudden change. This educational approximation does not replace official growth-chart software or clinical assessment.

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The chart renderer is unavailable. The same values remain available in the visit ledger.

AgeHeightWeightBMIHeight %Weight %BMI %Copy
{{ formatNumber(row.age_months, 1) }} mo{{ formatNumber(row.height_cm, 1) }} cm{{ formatNumber(row.weight_kg, 1) }} kg{{ formatNumber(row.bmi, 2) }}P{{ formatNumber(row.height_percentile, 1) }}P{{ formatNumber(row.weight_percentile, 1) }}P{{ formatNumber(row.bmi_percentile, 1) }}

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Growth Screening Flag Checker Screen serial child growth measurements for percentile drift and low height velocity, with age-routed adiposity checks and data-quality flags.
BMI-for-Age Percentile Calculator Calculate a child’s BMI-for-age percentile from measurements or known BMI and interpret it with WHO or CDC curves, z-scores and P95 checks.
Weight-for-Length Percentile Calculator Calculate weight-for-length percentile from WHO or CDC references with measurement correction, source comparison and growth-context cautions.
Growth Percentile Trend Calculator Review a child's height, weight or BMI percentile path across visits with WHO/CDC references plus band-crossing alerts and trend context.

Growth makes sense as a series, not as a single measurement. A height or weight near the edge of a chart may be ordinary for one child when it follows a steady path. A value near the middle can deserve attention when repeated measurements fall across several percentile bands or height gain slows sharply.

A growth chart compares a child's measurement with an age- and sex-specific reference. The percentile is a rank within that reference, not a health grade and not a prediction of adult size. The z-score expresses the same position as standard deviations from the reference center, which is useful for calculations but does not remove the uncertainty in the measurement or reference choice.

Measure What it adds Common caution
Height or length Shows linear growth and supports height velocity between visits. Standing height and recumbent length are not interchangeable.
Weight Shows mass change and helps reveal shifts relative to height. Clothing, scales, illness, and fluid balance can move one reading.
BMI-for-age Relates weight to squared height, then compares that index by age and sex. BMI is a screening measure and needs clinical context.
Height velocity Annualizes the height change between consecutive visits. Short or inaccurate intervals can magnify small measurement errors.

The reference changes around the second birthday in common U.S. practice. CDC guidance uses WHO standards from birth to age 2 and CDC growth charts from age 2 onward. At the same time, measurement may shift from recumbent length to standing height and from weight-for-length to BMI-for-age. A visible percentile change at that handoff can reflect the changed method and reference rather than a sudden biological change.

Accurate age, consistent technique, and enough time between visits matter more than extra decimal places. Duplicate ages need a deliberate choice about which measurement represents that visit. A low annualized velocity calculated from visits only a short time apart should be checked against the original dates and measurements before it influences a decision.

Growth charts contribute to an overall health picture; they are not diagnostic by themselves. Family growth patterns, puberty, nutrition, illness, medication, measurement quality, and the child's earlier path can all change interpretation. Concerns should be confirmed on the appropriate official chart and reviewed by a qualified clinician.

How to Use This Tool:

Use measurements from one child, one unit system, and a consistent chart sex profile.

  1. Choose Chart sex profile to match the official chart used for comparison.
  2. Enter 2 to 30 visits as age_months,height_cm,weight_kg. Ages may run from 0 to 240 months, heights from 30 to 230 cm, and weights from 1 to 200 kg.
  3. Set the height band-crossing count, BMI review percentile, and height-velocity floor. These are local screening thresholds, not diagnoses.
  4. Read Growth guidance before the chart. If a warning appears, recheck source measurements and then confirm the pattern on the age-appropriate WHO or CDC chart.

Interpreting Results:

The status summarizes the most urgent local rule, with critical cues taking priority over watch and data-verification cues. The suggested review window is 0.5 month for a critical cue, 1 month for a watch cue, and 3 months when no critical or watch rule fires. That interval is part of this screening heuristic, not clinical scheduling advice.

  • Prompt review means at least one critical rule fired, such as estimated height below the 3rd percentile, a large downward height-band crossing, or height velocity below the chosen floor.
  • Review suggested means a watch rule fired, including estimated weight below the 3rd or above the 97th percentile, BMI at or above the chosen threshold from 24 months onward, or a large weight shift.
  • Verify source data means duplicate ages were replaced by the last entered row. Confirm which observation should remain.
  • Routine monitoring means none of these local rules fired. It does not certify normal growth or replace review of the official chart.

Technical Details:

The report uses a repository-authored approximation rather than official WHO or CDC growth-chart tables. For each sex profile and measurement, it linearly interpolates a compact set of age anchors from 0 to 240 months. It then applies small reference-family adjustments, estimates a standard deviation, calculates a z-score, and maps that score through a normal-distribution approximation. Reported percentiles are clipped to 0.1 through 99.9.

Formula Core:

Body mass index and annualized height velocity are calculated from the entered measurements:

BMI= WH/1002 v= (H2−H1)×12A2−A1 z= x−MS

W is weight in kilograms, H is height in centimetres, and BMI is reported in kg/m². For velocity, H1 and H2 are consecutive heights in centimetres, while A1 and A2 are ages in months; the factor 12 converts the rate to cm/year. In the z-score, x is the measurement or BMI, M the adjusted interpolated median, and S the adjusted estimated standard deviation.

Calculations retain full floating-point precision through the main steps and round report values to six decimal places. Displayed evidence may be shortened further to one or two decimals. Ages duplicated after rounding to 0.001 month are consolidated before calculation, and the last entered measurement at that age wins.

Rule Core:

Signal Exact condition Severity
Low height positionLatest estimated height percentile < 3Critical
Weight edgeLatest estimated weight percentile < 3 or > 97Watch
BMI thresholdAge ≥ 24 months and estimated BMI percentile ≥ the chosen 85 to 99 thresholdWatch
Height-band dropDrop across at least the chosen 1 to 4 major bandsCritical
Weight shiftMovement across at least the chosen band count and at least 25 percentile pointsWatch
Low recent velocityLatest height velocity < the chosen 2 to 10 cm/year floorCritical

Major bands are divided at the 3rd, 15th, 50th, 85th, and 97th percentiles. A value exactly on a boundary enters the higher band. The optional 24-month marker changes only the chart annotation; it does not change calculations or rules.

Limitations and Privacy Notes:

This report is an educational screening aid, not a clinical growth chart, diagnosis, or treatment recommendation. Its anchors, adjustment factors, estimated standard deviations, normal-distribution conversion, band rules, and review windows are simplified local rules. They do not reproduce the LMS methods or complete reference tables used by official growth-chart software.

  • Confirm every concern on the appropriate official chart with exact birth date, visit date, measurement method, and clinical context.
  • Do not enter names, record numbers, or other identifying details. Only age, height, weight, sex profile, and threshold settings are needed.
  • Processing occurs in the browser. Keep exported tables and images protected if they become part of a health record or contain identifying context added elsewhere.

References: