Free · Browser-Based · Baby Milestones

Baby Age Calculator

Convert birth date into baby age in days, weeks, months, and years, and get simple milestone phrasing for pediatric visits, family updates, or planning.

Birth date

Check date

Premature birth weeks early

Milestone format

Baby age summary

🎯 Common Use Cases

Share age in weeks or months

Prepare for pediatric appointments

Track milestone-style age wording

Estimate adjusted age for preterm babies

❓ Frequently Asked Questions

Can this show adjusted age?

Yes. Enter weeks early and choose the medical milestone mode.

Does this replace medical advice?

No. It is only a date-based age helper, not a medical assessment.

Is the calculation local-only?

Yes. Dates are processed entirely in your browser.