Baby Age Calculator

Free Baby Age Calculator

Use this free baby age calculator to find your baby's exact age in weeks, months, and days - the way pediatricians, daycare forms, and vaccination schedules usually track early childhood age.

The first two years are often measured in weeks and months rather than years alone, since development changes quickly during this stage.

How to Use the Baby Age Calculator

• Select your baby's date of birth.
• Click Calculate Baby Age.
• View the exact age in weeks, months, and days, plus the general stage instantly.

Features

• Shows age in weeks - the most common way early infant age is tracked.
• Also shows the equivalent in months and days.
• Displays a general developmental stage label.
• Mobile-friendly with print, share, copy, and download options.

Frequently Asked Questions

Why is baby age often measured in weeks?

In the first months of life, babies develop quickly, so doctors, feeding schedules, and milestone charts often use weeks for more precision than months alone provide.

What ages count as newborn, infant, and toddler?

These are general, commonly used labels rather than strict medical categories: newborn usually refers to the first weeks, infant roughly up to a year, and toddler from about one to three years old.

Does this account for premature birth or adjusted age?

No, this calculator shows chronological age based on the date of birth you enter. For premature babies, doctors often also track "adjusted age" based on the due date - ask your pediatrician if that applies to you.

Is this calculator free?

Yes, this baby age calculator is completely free to use with no sign-up required.

Related Calculators

Want to check school eligibility down the line? Try our school age calculator. Curious about a pet's age instead? Check the pet age calculator.