About Infant Chart

Infant Chart is a free tool for plotting and interpreting infant and child growth — weight, length/height, head circumference, and BMI — against the standard pediatric growth curves used by clinicians worldwide. No signups, no accounts, no data stored. Enter your child's measurements and get an immediate, accurate percentile reading against the reference curves.

The site is part of the AJ Designer family of free engineering, science, and health calculators. You can find the full library at ajdesigner.com.

Who this is for

Infant Chart is used by parents tracking their child's growth between pediatric visits, by clinicians and nurses who want a quick plotting tool, by lactation consultants and public health workers, and by students learning to read growth curves. The tool is designed to be accurate enough for clinical reference and simple enough for a parent checking a number from last week's appointment.

Which growth standards the charts use

Infant Chart uses the two standard reference sets that pediatric practice is built on:

• WHO Child Growth Standards (birth to 24 months). These are the international standards published by the World Health Organization, based on a study of healthy, breastfed children across six countries. The WHO standards are recommended by the CDC, AAP, and most pediatric bodies for children under two.
• CDC Growth Charts (2 to 20 years). The CDC's reference charts are used for children and adolescents above age two in the United States and many other countries.

Each chart on the site cites which standard it uses and links to the primary source data. The percentile calculations are computed from the official LMS parameters published by the WHO and CDC, not approximated from chart images.

How the charts are verified

The underlying percentile math is implemented from the published LMS tables and cross-checked against the WHO and CDC reference calculators. Sample measurements are computed and independently verified against published examples. Each page cites its source data and shows when it was last reviewed.

I also get correction reports from readers — parents, clinicians, and nurses who spot a display issue or an edge case in the math. Those reports have caught real mistakes over the years, and I treat reader feedback as one of the most valuable forms of review this site gets. If you find an error, please email me.

A note on appropriate use

Growth charts are a screening tool, not a diagnostic one. A single percentile reading — high, low, or anywhere in between — does not by itself indicate a problem or its absence. What matters clinically is the trend over time and the full context of the child's health, and those are conversations for a pediatrician, not a website.

Use Infant Chart to plot, track, and understand your child's measurements. For any concern about growth, feeding, or development, talk to your child's healthcare provider.

About the author

Hi, I'm Jimmy Raymond. I'm an engineer and a parent, not a clinician — Infant Chart exists because I wanted a clean, reference-grade plotting tool for my own family, and I built it to the same standards I'd apply to any other engineering work.

I studied Environmental Engineering at New Mexico Tech (B.S.) and Computer Science at the University of New Mexico (B.S.), and most of my career has been in safety-critical aerospace, real-time embedded software, and full-stack web development. I've worked on systems where being wrong isn't an academic problem — the math and the reference data have to be right, traceable, and honest about what they do and don't tell you. Pediatric growth charts deserve exactly that level of care: the percentile math on this site is computed from the official WHO and CDC LMS parameters, not approximated from chart images, and every page cites its source.

The clinical judgment belongs with your child's pediatrician. The data handling and the plotting, I can vouch for.

I'm based in Albuquerque, New Mexico.

Contact

Email me at aj@ajdesigner.com for corrections, chart requests, or general feedback. You can also find me on LinkedIn.

— Jimmy