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In the meantime, our research-backed guides cover the same territory — what works, what does not, and which gear is worth waiting for.
Read the full Sleep Guide →Questions about sleep
When should I start using a sleep sack?
From the moment your baby outgrows the swaddle, which is usually between 8 and 12 weeks. The Wake Windows + Bedtime Calculator can help you spot the right age based on your baby is current schedule.
Do white-noise machines work?
Yes. The research is real — consistent, womb-volume white noise reduces wake-ups in the first 6 months. We test sound machines for actual decibel output, not marketing claims.
What is the safest sleep environment?
A bare crib with a fitted sheet and a sleep sack. No bumpers, blankets, pillows, or stuffed animals under 12 months. AAP guidelines are non-negotiable on this one.
When does the 4-month sleep regression end?
It does not exactly end — it is a permanent change to how your baby sleeps. The disrupted nights last around 2 to 4 weeks; the new sleep architecture is forever. Full breakdown in our 4-month sleep regression guide.