Baby sleep,
explained by science
Practical, jargon-free guides grounded in 35+ scientific studies, the same ones that power the Bercea algorithm.
🕐 Wake windows: the chart by age
How long can your baby comfortably stay awake at each age? The reference chart from 0 to 24 months, with the tiredness cues to watch for.
📖 6 min📉 The 4-month sleep regression: myth or reality?
No published study shows a universal spike in night wakings at 4 months. What actually changes, and how to support it.
📖 5 min🎵 White noise: benefits and safe volume
16 of 20 newborns asleep in 5 minutes in a 1990 trial, but watch the volume. What 30 years of studies say, and the mistakes to avoid.
📖 4 min😴 How much do babies sleep? The chart by age
Total sleep, nights and naps from 0 to 24 months, based on WHO recommendations, and how to read the ranges.
📖 5 min🛁 The bedtime routine, step by step
One of the best-studied practices for baby sleep: what the trials show, the steps, the ideal length and the common mistakes.
📖 5 min🌤️ The 2 to 1 nap transition
Most often between 15 and 24 months, sometimes from 12. The signs your baby is ready, a gradual method and the pitfalls to avoid.
📖 5 min🥕 Starting solids
When to start solids, how to introduce allergenic foods, which textures, and what to avoid before age 1: the French guidelines, explained.
📖 4 minSleep month by month
Sleep, nap and wake-window ranges for each age, and what changes at that point.
🌱 3-month-old baby sleep
How much does a 3-month-old sleep, how many naps, what wake window? The WHO and HAS ranges, and what changes at this age.
📖 3 min🌗 4-month-old baby sleep
A 4-month-old: how much sleep, how many naps, what wake window, and what about the 4-month sleep regression? The ranges, with sources.
📖 3 min🌙 6-month-old baby sleep
How much does a 6-month-old sleep? Total sleep, dropping from 3 to 2 naps, wake windows and night waking: the ranges for this age.
📖 3 min🧸 9-month-old baby sleep
A 9-month-old: how much sleep, two naps, wake windows, night waking and separation anxiety. The ranges for this age.
📖 3 min🎂 12-month-old baby sleep
How much does a one-year-old sleep? Total sleep, one or two naps, wake windows and the bedtime routine: the ranges for 12 months.
📖 3 min