Infans Infans is a privacy-first baby tracking app with Nostr-based encrypted data storage and parent-to-parent sync. Features: Feeding tracking — bottle (ml/fl oz), breast (L/R/both + duration), solids Sleep tracking — start time + duration Weight & height — kg/lb/oz with optional height (cm/in) Diaper tracking — wet/dirty/both Bath tracking Milestones — first smile, first word, etc. Growth charts — WHO weight-for-age percentile bands (P3/P50/P97) for boys/girls Activity trend charts — daily/weekly/monthly/yearly for all metrics 7-day trend bar charts — feeding and sleep trends on the Summary tab Encrypted backup — all data encrypted with NIP-44 and stored on Nostr relays as kind 30078 events Parent sync — share data with co-parent via NIP-44 encrypted kind 30078 partner-sync events Live timer sync — start a nap timer on one phone, stop it on the other; both parents see the running timer in real time Notes — leave async notes for the other parent (synced inside the same encrypted payload) Offline-first — Room database is the local source of truth; Nostr syncs in the background No telemetry, no analytics, no tracking. Your data stays yours — encrypted on Nostr relays you choose. Medical Disclaimer: Infans is a convenience tool for logging and syncing everyday baby-care records. It is NOT a medical device, medical application, or source of medical information. It does not provide medical advice, diagnosis, or treatment recommendations. Growth charts and percentile bands are derived from public WHO reference data for general informational purposes only and are not a substitute for assessment by a qualified healthcare professional. Always consult a licensed pediatrician for questions about your baby's health, growth, or development. The authors assume no responsibility for decisions made based on data displayed or stored by this app. Security Notice: This app has NOT undergone a third-party security audit. The cryptographic implementation (NIP-44 v2 encryption, key management, Nostr event signing) was written from scratch following published specifications and includes test vectors from the reference implementation, but has not been independently reviewed or verified by a security professional. No warranty is made about the fitness of this software for protecting sensitive data. Use at your own risk.