Sources

Typical total, nighttime, and daytime sleep hours by age come from Table 1 of Iglowstein et al. 2003, Pediatrics 111:302 (Zurich Longitudinal Studies, n=493). The youngest published row is 6 months, so we do not invent ranges for younger babies.

Average fuss/cry durations in the first 12 weeks follow the fussing/crying meta-analysis summarised in the product research (roughly 117-133 minutes a day in the first 6 weeks, falling to about 68 minutes by 10-12 weeks). We present a curve, not a “6-week peak” - that peak is not consistently supported across studies.

Wessel’s rule of threes remains the conventional duration threshold used when discussing colic in paediatric guidance; it is a pattern description, not a diagnosis the app makes.

“Wake windows” as sold by many trackers do not have a peer-reviewed evidence base as fixed rules. The mechanisms that do matter are sleep pressure and circadian rhythm. Our personalised timings are arithmetic over your baby’s own recent logs, not a lookup against a generic table. How it works explains that in more detail.

Sleep-related screens stay aligned with Lullaby Trust / NHS safer sleep guidance in the UK (back to sleep, clear cot, room temperature around 16-20°C, room-sharing through the early months) and the equivalent authority guidance in other markets when we launch there. Nothing we surface should contradict that guidance.

The optional bottle-feed discard timer follows NHS/WHO preparation and storage rules: prepare with water at least 70°C, and discard feeds within about 2 hours of preparation or 1 hour after a feed begins. It is a quiet reminder, not a medical claim.

We do not publish accuracy percentages for suggestions. We do not treat public cry-audio corpora as ground truth for a baby’s need. Discrete “cry type” translators from audio alone remain scientifically weak; any future cry help will combine logged context with parent confirmation, after regulatory review.