The Slumber Lab

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What Should My Baby Wear Under a Sleep Sack? A Simple Layering Guide
baby clothing

What Should My Baby Wear Under a Sleep Sack? A Simple Layering Guide

Wondering whether your baby needs a onesie, pajamas, or just a diaper under a sleep sack? Here's how to think about layers without overcomplicating bedtime.

baby bedtimeWhy Does My Baby Hate the Sleep Sack? 7 Things to Try

Why Does My Baby Hate the Sleep Sack? 7 Things to Try

Your baby was perfectly happy in your arms—but the second the sleep sack goes on, the crying starts. Here are seven things to check before giving up on the sleep sack.

baby sleep temperatureWhy Is My Baby Sweating While Sleeping?

Why Is My Baby Sweating While Sleeping?

If your baby wakes up sweaty, has damp hair, or feels hot during sleep, you may wonder whether they are too warm. Here’s how to check and what to change.

baby bedtimeWhy Does My Baby Wake Up When I Put Them Down at Night?

Why Does My Baby Wake Up When I Put Them Down at Night?

Why does your baby wake up the second you put them down? Learn why bedtime transfers fail and simple ways to make the move from arms to crib smoother.

baby sleep sackCan a Sleep Sack Be Too Tight? How to Check the Fit

Can a Sleep Sack Be Too Tight? How to Check the Fit

Can a sleep sack be too tight? Learn how a baby sleep sack should fit, what signs to check, and when it may be time to size up.

baby fights sleep sackBaby Kicks Off Their Sleep Sack? What Parents Can Do

Baby Kicks Off Their Sleep Sack? What Parents Can Do

Does your baby keep kicking off their sleep sack? Learn why it happens, what to check, and when a different fit or walker sleep sack may help.