Cradle's predictions, schedules and guidance are grounded in published pediatric sleep research and current AAP policy. Below are the sources behind everything the app suggests. This page mirrors the Research basis screen inside the app.
Cradle is not a substitute for medical advice, and it is not a medical device. For anything that worries you about your baby's sleep, feeding or development, please call your pediatrician.
We make no claim that Cradle causes babies to sleep longer. Nothing on this site is a clinical result. The wake-window method is drawn from the published pediatric sleep literature below and checked against our own logged data; how any individual baby responds varies.
Cradle never recommends a sleep position, sleep surface or co-sleeping arrangement that conflicts with current AAP safe-sleep guidance. The AAP statement is the standing reference for everything we say about where and how a baby should sleep. It is not a source for wake-window scheduling, and we don't cite it as one.
publications.aap.org/pediatrics/article/150/1/e2022057990/188304Our regression / growth-spurt / "leap" callouts on the Insights tab reference the developmental-leap framework popularized by The Wonder Weeks. We surface these as patterns to watch, not as diagnoses.
thewonderweeks.comCluster-feeding callouts, on-demand feeding cadence and the app's philosophy that frequent newborn feeds are normal are aligned with AAP breastfeeding guidance and supplemented by educational material from La Leche League International.
publications.aap.org/pediatrics/article/150/1/e2022057988/188347Practical guidance on cluster feeding, growth-spurt feed cadence and night-feeding norms is drawn from La Leche League educational material in addition to the AAP policy statement above.
lllusa.orgCradle's growth percentiles are computed from the published WHO Child Growth Standards LMS tables for ages 0–24 months — the reference pediatricians use for babies in this age range. Percentiles are descriptive, not diagnostic: only your pediatrician can interpret them for your child.
who.int/tools/child-growth-standardsThe CDC (and AAP) recommend the WHO growth standards for children under 24 months in the United States — CDC-specific charts take over at age 2. This is why Cradle's growth percentiles use the WHO curves.
cdc.gov/mmwr/preview/mmwrhtml/rr5909a1.htmThis is the basis for the wake-window ladder and the nap counts by age. The standard pediatric sleep literature on wake windows, overtiredness and age-banded scheduling sets the shape of our bands; where authors differ slightly, HealthyChildren.org is used as a cross-check on the age ranges themselves. It is cited for ranges only — no pediatric body endorses any particular scheduling method, and we do not imply one does.
healthychildren.org — ages & stages: sleepEvery age band we publish is sense-checked against what families actually record in the app. This data tests the bands; it does not produce them, and it cannot validate them — Cradle shows a window, a parent logs that window, and we count the match, so a wrong ladder would produce data that looks just as tidy. Every figure describes what was logged, not what was measured: Cradle is not a monitor, a missed log is invisible to us, and these totals are floors rather than ground truth.
Cradle is built and maintained by Creator Lane Studios LLC. We update this page when we change a recommendation or add a feature that draws on a different source.