Baby Age Difference Calculator
Enter two birth dates to see the age gap in days, weeks, and months.
Calculator
Useful for siblings, playgroups, milestones, and planning.
Enter both birth dates to see the difference.
How the calculation works
We compare the two birth dates using calendar-accurate date math and show the difference in years/months/days plus totals (days and weeks). Months are calendar months (not a fixed 30-day estimate).
FAQ
Can I use this for siblings (not only babies)?
Yes. It works for any two people — it’s just optimized for baby-age language.
Is “months difference” exact?
Yes. It’s calculated using real calendar months and days.