LullsongBaby sleep, by the evidence
Free tools and short guides for tired parents. Every study-based number links to its source, and we say when the evidence is thin.
Tools
Wake window calculator
How long your baby can stay awake between sleeps, with average sleep from 34 studies.
Nap schedule maker
Enter your baby’s age and wake-up time for a starting-point plan for naps and bedtime.
Guides
Safe sleep: the essentials
Back, flat, clear and close: the 2022 American Academy of Pediatrics rules in plain words.
Sleeping through the night: what’s normal
Many babies still wake at night at one year. What large studies show, and whether it matters.
The 4-month sleep regression: what’s actually known
No study defines it. What research does show about sleep changes around four months.
Wake windows: what the research actually says
A popular rule of thumb that no trial has tested. What is known, and how to use it.
Is white noise safe for babies?
Volume, distance and timers, from the research on infant sound machines.
When to stop swaddling
Stop when rolling starts. What the research says about swaddling risk and healthy hips.
Room temperature and what to wear
16 to 20°C, light layers, no hat indoors: how to keep your baby from getting too hot.
Contact naps: what’s safe and what’s known
Napping on you is normal. How to keep it safe, and what research says about closeness.
Dream feeds: do they work?
A late feed before you go to bed. What the one trial found, and how to try it.
Lullabies and singing: what the research shows
Lullabies calm babies across cultures, and singing beats talking. The studies, in plain words.
Lullsong
Lullsong plays soft white noise and lullabies for naps and bedtime, with a 30-minute timer on by default.