Baby Age Calculator
Track your baby's growth week by week and month by month. This calculator gives you a precise age in both formats, perfect for tracking developmental milestones, scheduling appointments, or just cherishing how quickly they grow. Simply enter your baby's date of birth to see their current age.

Your Baby's Age Is

26w 0dWeeks & Days
5m 29dMonths & Days

Tracking Milestones

Knowing the age in weeks is great for tracking early development milestones!

Calculation Explained

How The Age is Calculated

The baby age calculator determines the time elapsed between the baby's date of birth and today's date, presenting it in two common formats for tracking early development.

  • Weeks & Days: This is the most common format for tracking newborns. The calculator finds the total number of days lived, divides it by 7 to get the full weeks, and the remainder is the number of extra days.
  • Months & Days: For this format, the calculator determines the number of full calendar months that have passed since birth, and then counts the remaining days.

Example Calculation

Using the date of birth you provided, here's how we calculated the age:

  • Date of Birth: June 2, 2025
  • Current Date: December 1, 2025

First, we calculated the total number of days between these two dates. Dividing this total by 7 gives us 26 full weeks with 0 days left over.

Separately, we calculated the number of full months and remaining days between the dates to get 5 months and 29 days.

Baby Age Examples
These scenarios use today's date to show how the calculator breaks down a baby's age into weeks and months with a detailed explanation of the math behind it.

Three-Month Checkup

A baby born a little over three months ago coming in for a routine pediatric visit.

Date of Birth: August 28, 2025

Today: December 1, 2025

13w 4d

Weeks & Days

3m 3d

Months & Days

How the calculation is done
  1. Count the days from birth to today: 95 days.
  2. Divide by 7 to get full weeks (13) and note the remainder (4 days).
  3. Use calendar months between the dates to find 3 months with 3 extra days.

Two-Week Newborn

A newborn heading to their two-week check-in with the doctor.

Date of Birth: November 16, 2025

Today: December 1, 2025

2w 1d

Weeks & Days

0m 15d

Months & Days

How the calculation is done
  1. Count the days from birth to today: 15 days.
  2. Divide by 7 to get full weeks (2) and note the remainder (1 days).
  3. Use calendar months between the dates to find 0 months with 15 extra days.