Baby Sleep — Everything You Need to Know

Wake Windows by Age

A wake window is the amount of time your baby can comfortably stay awake between sleeps. Staying within wake windows prevents overtiredness — the #1 cause of sleep problems in infants.

The 4 Sleep Regressions Explained

Sleep regressions are temporary disruptions caused by developmental leaps. Understanding why they happen makes them easier to survive.

• 4-month regression — Permanent shift in sleep architecture. Baby now cycles like an adult (light-deep-REM) every 45 min. Lasts 2–6 weeks.
• 8–10 month regression — Driven by separation anxiety and massive motor development (crawling, pulling to stand). Lasts 3–6 weeks.
• 12-month regression — Tied to the transition from 2 naps to 1. Also coincides with walking and first words.
• 18-month regression — Language explosion + molars + independence drive. One of the hardest. Usually resolves in 4–6 weeks.

Safe Sleep Guidelines (AAP 2024)

• Always place baby on their back for every sleep until age 1
• Use a firm, flat surface — approved crib, bassinet, or play yard with a fitted sheet only
• No soft objects — no pillows, bumpers, positioners, loose blankets, or stuffed animals
• Room-share without bed-sharing for at least the first 6 months, ideally 12 months
• Keep sleep space smoke-free and avoid overheating — baby's room should be 68–72°F (20–22°C)
• Pacifier at nap and bedtime reduces SIDS risk by up to 90% — offer after breastfeeding is established