Enter a gestational week to see a reference fetal length and weight and a familiar everyday size analogy, from the first weeks to full term. This is an approximate reference, not medical advice; for any health concern or emergency, contact your pediatrician or emergency services, and follow WHO, CDC or your local health authority guidance.
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How to Use the Fetus Size Comparison
Enter the gestational week and press Compare Size. You get a typical length and weight for that week and a familiar object to picture it by.
Reading the result
Early weeks use crown-to-rump length; from about week 20 the figure is crown-to-heel.
The analogy is a rough comparison only, not a measurement of your baby.
Weights are rounded averages and normal babies vary widely.
Weeks 4 through 40 are covered.
Features
Reference length and weight for every week from 4 to 40
A familiar size analogy for each week
Bundled locally, no download needed
This is an approximate reference, not medical advice; for any health concern or emergency, contact your pediatrician or emergency services, and follow WHO, CDC or your local health authority guidance.
All processing runs locally in your browser. Your data is not uploaded to any server.
If your clinic gives you a measurement that differs, that is normal. Growth is judged by the trend on your own chart over time.