Baby Age Calculator

Track every precious moment. Calculate your baby's age in precise units and view growth milestones.

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Weeks--
Days--
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How It Works

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Enter Birth Date

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Calculate

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Explore Results

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📱 Works on any device including mobile

Baby Age Calculator — Exact Age in Weeks and Months

Parents need to know their baby's age in weeks (first few months) and then months — not just "born in March." Pediatricians use exact ages for developmental milestone tracking, vaccination schedules, and nutrition guidance.

Quick answer: Enter your baby's date of birth above. The calculator shows exact age in days, weeks, months, and years. For school admission eligibility, use the "Age As Of Date" feature with the school's cut-off date.

Baby Age Chart — First Year

AgeDaysDevelopmental Stage
Newborn0–7 daysFeeding, sleep establishment
2 weeks~14 daysWeight regained to birth weight
1 month~30 daysSocial smiling begins
2 months~61 daysHead control developing
3 months~91 daysBatting at objects
4 months~122 daysRolling attempts
6 months~183 daysSolid foods introduction
9 months~274 daysPulling to stand
12 months~365 daysFirst birthday 🎂

Why "4 Weeks" ≠ "1 Month"

This confuses most new parents. Four weeks = 28 days exactly. One calendar month = 28, 29, 30, or 31 days — depending on which month. Pediatricians always use calendar months (same date, next month), not 4-week blocks.

A baby born on the 15th is 1 month old on the next 15th — regardless of whether that is 30 or 31 days later.

Premature Baby — Corrected Age

If born prematurely, use corrected age for developmental milestones:

Formula: Corrected age = Chronological age − Weeks premature

Example: Born 8 weeks early → chronological age 6 months → corrected age 4 months

Most pediatricians stop using corrected age at 24–36 months, when the gap becomes less clinically significant.

School Admission Age — Key Cutoffs

StateNurseryLKGClass 1
Delhi3 years by March 314 years by March 315 years
Maharashtra3 years by June 304 years by June 305 years
Karnataka3 years by June 14 years by June 16 years
Tamil Nadu3 years by June 304 years by June 305 years

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Frequently Asked Questions

Count the exact days from birth to today, then divide by 7. A baby born 70 days ago is exactly 10 weeks old. Use the calculator above for an instant, exact result.
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