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/who-growth-charts

by odrobnik

Generate WHO child growth charts (height, weight, BMI) with percentile curves. Downloads official WHO reference data on demand. Use when users ask about child growth tracking, percentiles, or want gro

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Generate WHO Child Growth Standards charts with percentile curves and child data overlay.

Features

  • Height-for-age (0-19 years)
  • Weight-for-age (0-10 years)
  • BMI-for-age (0-19 years)
  • Supports boys and girls
  • Downloads WHO data on demand from cdn.who.int (cached locally)
  • Overlays child's actual measurements with trend line

Examples

Height Weight BMI

Prerequisites

Install Python dependencies:

pip install pandas matplotlib scipy openpyxl

Usage

Basic Chart Generation

python3 ./scripts/growth_chart.py "Child Name" "DD.MM.YYYY" --sex F --type all

Arguments:

  • name: Child's name (used in chart title)
  • birthdate: Date of birth in DD.MM.YYYY format
  • --sex / -s: F (female) or M (male) — default: F
  • --type / -t: height, weight, bmi, or all — default: all
  • --data / -d: JSON file with measurement data
  • --output / -o: Output directory for charts

With Measurement Data

Create a JSON file with height/weight measurements (heights in meters, weights in kg):

{
  "heights": [ ["2024-01-15T10:00:00", 1.05] ],
  "weights": [ ["2024-01-15T10:00:00", 17.5] ]
}

python3 ./scripts/growth_chart.py "Emma" "06.07.2016" --sex F --data emma_data.json --type all

Integration with Withings

Combine with withings-family skill to fetch weight data automatically:

# Get Withings weight data (assuming withings-family skill is installed)
python3 ../withings-family/scripts/withings.py emma body > /tmp/withings.json

# Parse and generate charts
# (The growth chart script handles Withings JSON format if implemented, otherwise transform it)

Output

Charts are saved as PNG files in ~/clawd/who-growth-charts/ by default (or specified output directory). Data cache and assets are stored in ~/clawd/who-growth-charts/cache/.