A Baby Tracker Built for 3am
A calm, private record of feeds, nappies and sleep, designed for one hand in a dark room and a phone with no signal.
Timeline
Live on the App Store since September 2026
Client
Little Logbook (our own product)
Health / Family
The problem
It started with a baby in neonatal care and a parent trying to keep track of feeds on a phone, at night, in a room where you do not want a bright screen.
We wanted a quiet screen with the next action in reach. It had to work with one hand and no signal, and let the family take their records with them.
And nothing handled the start we actually had. A baby who spent weeks in neonatal care is not the same age as the calendar says, so every milestone, every centile and every “is this normal yet” question is measured against the wrong clock.
What we built
- Dark by default, one-handed, repeat the last entry
- The 3am feed is the whole design brief. No login to fail, a shared PIN, and each device stamps who logged it so two parents never argue about whether it was done.
- One optional question about neonatal care. Asked once.
- One optional question at signup, per baby rather than per family because twins can have different starts. Answer it and corrected age quietly becomes the clock every milestone runs on. Never inferred from gestation: term babies go to neonatal care and some preterm babies never do.
- It works with no signal
- Writes are idempotent against a client-generated ID and queue in an outbox. Hospital corridors and 3am nurseries are exactly where the bars disappear.
- Every family gets its own database schema
- Not a tenant column that one missing WHERE clause defeats. Backups run continuously and a single-family restore has been rehearsed and written down, because this is a record of somebody’s child.
- The AI answers from this baby’s own records
- Not generic advice with a chat box on it. And the delete is a real ceremony: object storage is purged before the database row, so leaving takes the photos too.
What it did
- ✓In daily use through pregnancy, neonatal care and the first year
- ✓Growth plotted against RCPCH UK-WHO centiles, descriptive only and never diagnostic
- ✓Self-serve export, so a family can take the whole record and leave
- ✓Continuous point-in-time backups with a drilled single-family restore runbook
- ✓iOS app plus a PWA, so a partner without the app can still log a feed
- ✓Live on the App Store, with self-serve signup, so any family can start a logbook without an invitation
Technical details
The technology behind Little Logbook (our own product)'s project.
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