Newborn Age Calculator
Enter a baby's date of birth to see their exact age in weeks, months and days.
About this calculator
This newborn age calculator is built around how paediatric milestones and check-up schedules are usually discussed — in weeks for the first few months, then months after that.
Enter the date of birth once to see all three views (weeks, months, days) at the same time, useful for vaccination schedules, growth tracking, or simply satisfying curiosity about exactly how old a baby is today.
How it works
Enter the baby's date of birth
Use the exact birth date.
Calculate
The engine works out the exact elapsed time to today.
Read the breakdown
See age in weeks, months, and the exact years/months/days figure.
Frequently asked questions
Why measure in weeks for young babies?
Paediatricians commonly track early development and feeding/sleep milestones in weeks because change happens quickly in the first few months.
Does this replace a paediatrician's growth tracking?
No — this is a simple age calculator. Growth and developmental assessments should come from a qualified paediatrician using proper growth charts.