Developmental concerns: observations, screening, and help
Bring specific concerns to a clinician; a milestone checklist is not a diagnosis.
← All parenting toolsEveryday numbers · FREE TO USE
Baby age calculator
Calculate age in weeks, calendar months and days, plus your baby’s first-birthday date.
THE LITTLE DETAILS
Made for your everyday.
Weeks count groups of seven days; calendar months follow the date on the calendar. Enter a birth date and a reference date to see both. Month-end birthdays use the last available day of a shorter month. These are calendar calculations, not developmental assessments.
Three small steps
- Enter the birth date.
- Choose a reference date or use today.
- Read weeks, months and milestone dates.
Are four weeks the same as one month?
Four weeks are 28 days. Calendar months vary in length, so the two displays can differ. This tool reports chronological age, without a prematurity adjustment.