Fetal Weight & Length Estimator
See the estimated weight and length of your baby based on gestational week.
Enter a week between 8-42
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Frequently Asked Questions
How accurate are fetal weight estimates?
Estimates are based on population averages and can vary by 15-20%. Individual babies may be larger or smaller than average.
When is fetal length measured differently?
Before week 20, length is measured crown-to-rump. After week 20, it's measured crown-to-heel (full length).