About Baby Age Calculator.
A small, focused tool for a surprisingly easy-to-mix-up question: how old is my baby today?
A clear answer to a date question
We built the experience around dates parents already know. Enter a birth date, choose Today or another date, and see calendar months, weeks and elapsed days together. Corrected age is a separate, clearly labelled mode.
We do not ask for a baby’s name, sex, birth time or an account to use the calculator. There is no AI generation or paid calculation API.
What we mean by a milestone
Our calendar milestones are anniversaries: a completed calendar month, 100 elapsed days and the first birthday. They are opportunities to mark a date, not deadlines for a child to perform a skill.
Developmental resources live separately and link to the actual source. We do not produce a developmental score or describe these pages as medically reviewed.
Understand and check the result
The methodology explains day zero, month ends, leap days and the 40-week reference used in corrected mode. Worked examples make those choices reproducible.
If something looks wrong, start with the two input dates and the stated month-end convention. Use our contact page to prepare a local feedback note without including personal dates.
Does calculating require an internet connection?
Loading this website requires a normal page request. Once the tool has loaded, its date calculations run in the browser without a calculation API or an AI service. The same local engine powers every unit and anniversary view.
That does not promise an installed offline app: a later reload, an external source or a browser update can still need a connection. The privacy page explains local storage and the separate hosting requests.