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  4. Fetal Development Week Calculator
Date & Time CalculatorPregnancy & Baby

Fetal Development Week Calculator

Track your baby's weekly development milestones including size, weight, and key organ developments throughout your pregnancy journey.

Updated 2025-01-154 min read

Calculator

Enter your values below

Select the first day of your last menstrual period.

Leave blank to use today's date.

Formula & Methodology

How this calculator works

Week = floor((Today - LMP) / 7)

Calculates the current gestational week to match it with developmental milestones and fetal size comparisons.

Frequently Asked Questions

Common questions about this calculator

Disclaimer

These calculators are for informational purposes only. While we strive for accuracy, results should not be used as the sole basis for important decisions.

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