What is stored, and where
Date of birth, gestational age at birth, visit dates, measurements and notes are written to localStorage in this browser only — the per-site storage area documented by MDN, which is scoped to this site's origin. There is no server database, no account, and no synchronisation between devices. Clearing your browser data erases everything, permanently and irreversibly.
Privacy-first usage analytics
To know whether the tool is actually useful, AdjustedAge counts how often a small set of actions happen — a calculation, a saved visit, a PDF or CSV export, a print. It records the name of the action and nothing else. It never records a date of birth, gestational age, weight, length, head circumference, note text, name, IP address or device identifier, and it sets no cookies and no cross-site identifiers.
These counts also stay on your device. You can read them, switch them off, or delete them right here:
Your local usage counts
Nothing recorded on this device.
Offline use
The published site can be installed to your home screen and used offline. The offline copy caches the pages and code of the site itself — never your baby's data, which was already local and never travelled anywhere.
No advertising, no sponsorship
There are no ad networks, no third-party trackers, no embedded social widgets and no infant-formula sponsorship on this site. That is a deliberate editorial position: several of the pages ranking for these searches are published by formula manufacturers.
Contact and corrections
Questions about data handling, or a correction to the clinical content, go to Dr. Zeeshan Islam, MBBS, MCPS (Pediatrics) — see the contact details and corrections log on the about page. Anything we change after publication is dated and listed there rather than silently edited in.