How to Set Up a Safe Sleep Space for Your Baby

How to Set Up a Safe Sleep Space for Your Baby

To set up a safe sleep space, follow the AAP's ABCs: Alone (no other people or objects in the sleep area), Back (always place baby on their back), and Crib (a firm, flat CPSC-approved surface). Use a bare crib with only a tight-fitting sheet — no blankets, pillows, bumpers, stuffed animals, or positioners. Keep the room between 68-72°F and share the room (but not the bed) for at least the first 6 months.

These guidelines are not suggestions — they are evidence-based practices supported by decades of research. The AAP's 2022 safe sleep policy statement reports that approximately 3,500 infants die annually in the United States from sleep-related causes, including SIDS, accidental suffocation, and strangulation. The vast majority of these deaths involve an unsafe sleep environment.

What are the ABCs of safe sleep?

The American Academy of Pediatrics (AAP) summarizes safe sleep with three letters:

A — Alone

Your baby should sleep alone in their own sleep space. No pillows, blankets, bumper pads, stuffed animals, or positioning devices. Just baby on a mattress with a fitted sheet. This might look stark, but it's the safest environment.

The AAP's 2022 policy statement emphasizes that bed-sharing is associated with a significantly increased risk of sleep-related death, particularly for infants under 4 months, premature babies, and infants whose parents smoke or have consumed alcohol. A 2013 meta-analysis published in BMJ Open found that bed-sharing increased the risk of SIDS by a factor of 2.7, even in the absence of other risk factors.

B — Back

Always place your baby on their back to sleep, for every sleep — naps and nighttime. Back sleeping reduces SIDS risk significantly compared to side or stomach sleeping. Once your baby can roll both ways independently, they can find their own sleep position, but always start them on their back.

The NIH's "Back to Sleep" campaign (now "Safe to Sleep"), launched in 1994, has been credited with reducing the SIDS rate in the United States by more than 50%. Despite this progress, a 2023 CDC report found that 21.6% of mothers reported placing their infant in a non-supine sleep position at least some of the time, indicating continued need for education.

C — Crib

Use a firm, flat mattress in a safety-approved crib, bassinet, or play yard. The mattress should fit snugly with no gaps around the edges (if you can fit two fingers between the mattress and the side, it's too small). Only use the mattress that came with the sleep space or one specifically designed for it.

How do you choose a safe crib?

A full-size crib is the most common choice and what your baby will sleep in for the longest. Look for these features:

Safety certifications

Every crib sold in the US must meet CPSC safety standards, but look for JPMA certification as an additional quality indicator. Our best cribs and bassinets guide has specific recommendations.

Mattress height settings

Most cribs have 3-4 mattress height positions. Start with the highest setting for newborns (easier to lay them down) and lower it as baby learns to sit and pull up.

Slat spacing

Slats should be no more than 2-3/8 inches apart. This is a federal requirement for new cribs, but be cautious with vintage or secondhand cribs that might not meet current standards.

No drop-side rails

Drop-side cribs were banned in 2011 due to safety concerns. If anyone offers you one, decline it regardless of condition.

What kind of mattress does your baby need?

The crib mattress is arguably more important than the crib itself. Here's what to look for:

Firmness

The mattress should be firm enough that it doesn't conform to the shape of your baby's face. Press your hand into it — if it springs back immediately, it's firm enough. If your hand leaves an impression, it's too soft.

The CPSC's 2022 Safe Sleep for Babies Act strengthened requirements for infant sleep surfaces, mandating that all products marketed for infant sleep meet the firmness requirements of ASTM F3118. A mattress that conforms to an infant's face can obstruct the airway. The AAP recommends the hand test: press your hand into the mattress surface — if it retains the impression, it is too soft.

Fit

The mattress should fit snugly in the crib with no gaps. A too-small mattress creates entrapment hazards.

Waterproof cover

A waterproof mattress or waterproof cover is practical and hygienic. Avoid thick, quilted mattress pads — a thin, fitted waterproof sheet under the fitted crib sheet is all you need.

Certifications to look for

Greenguard Gold and CertiPUR-US certifications indicate lower chemical emissions, which matters for something your baby spends 12-16 hours a day on.

How should you set up the nursery for safe sleep?

Room temperature

Keep the room between 68-72 degrees Fahrenheit. Overheating is a SIDS risk factor. Dress baby in a sleep sack or footed pajamas rather than using blankets to stay warm.

Overheating is an independent risk factor for SIDS. The AAP recommends maintaining the nursery at 68-72°F (20-22°C) and dressing the infant in no more than one additional layer than an adult would need. A 2017 study in the journal Pediatrics found that room temperatures above 75°F were associated with a significantly increased risk of sleep-related infant death.

Sound machine

White noise at a moderate volume (around 50 decibels, roughly the volume of a shower) can help baby sleep more soundly and mask household noise. Place it across the room from the crib, not right next to baby's head. The Hatch Rest+ is our top recommendation.

Darkness

A dark room helps baby produce melatonin and sleep better. Blackout curtains or shades are a worthwhile investment, especially for naps when daylight is strong.

Air circulation

A ceiling fan or gentle room fan provides air circulation, which some research suggests may reduce SIDS risk. Keep it on a low setting — the goal is gentle air movement, not a breeze directly on baby.

What items should never go in the crib?

This is where it gets hard emotionally, because an empty crib can look cold and uninviting. But every item in the crib beyond the fitted sheet is a potential hazard:

Remove these items

• Pillows and pillow-like items
• Loose blankets of any kind
• Crib bumper pads (including mesh bumpers)
• Stuffed animals and toys
• Sleep positioners and wedges
• Extra mattresses or padding

The crib should contain only a firm mattress with a fitted sheet. If baby needs warmth, use a wearable blanket (sleep sack) that they can't pull over their face.

Should you start with a bassinet or a crib?

Many families start with a bassinet beside the bed for the first few months, then transition to the crib. Both are safe options as long as they meet CPSC standards. A bedside bassinet makes nighttime feeds easier and follows the AAP recommendation of room-sharing (not bed-sharing) for at least the first six months.

Our top bassinet pick is the Halo BassiNest, which swivels and tucks over the bed for easy access.

When should you transition to a new sleep space?

Bassinet to crib

Move to the crib when baby outgrows the bassinet's weight limit, starts rolling, or reaches the age limit (typically around 5-6 months). Some families transition earlier, and that's fine.

Crib to toddler bed

Most children transition to a toddler bed between ages 2-3, usually when they start climbing out of the crib. There's no rush — if your child is happy and safe in the crib, keep them there.

What's the most important thing to remember about safe sleep?

Setting up a safe sleep space isn't complicated, but it requires discipline: firm mattress, fitted sheet, nothing else. It might not look Pinterest-worthy, but it's the safest environment for your baby. For specific product recommendations, visit our cribs and bassinets and sleep essentials category pages.

Further Reading

• Cribs & Bassinets
• Sleep Essentials
• Baby Monitors