Safety

When can a baby sleep with a blanket?

S&M Sam & Mia · May 9, 2026

Short answer

Twelve months at the earliest, eighteen months by most pediatric guidance. Before 12 months, anything loose in the crib — blankets, pillows, stuffed animals, bumpers — increases SIDS and suffocation risk. Use a TOG-rated wearable sleep sack instead until then. After the first birthday, a small thin blanket is fine; a comforter or weighted blanket is not.

The rule

The AAP's 2022 safe sleep guidelines: nothing soft in the sleep space until at least 12 months. That means no blankets, pillows, comforters, sleep positioners, crib bumpers, sheepskins, stuffed animals, or anything else that can get near the baby's face.

At 12 months, the safe-sleep risk profile changes meaningfully:

The baby has the motor control to move blankets off their face if they end up there
SIDS rates drop dramatically after 12 months (the 0-12 month window contains the vast majority of SIDS deaths)
The baby can roll, crawl, sit up, and self-rescue in ways an infant can't

Most pediatricians extend the recommendation to 18 months for additional safety margin, particularly for any baby who's still in the crib (not transitioned to a toddler bed). Twelve months is the floor; 18 months is the conservative recommendation; 24 months is when pretty much everyone agrees.

What goes wrong with blankets in the crib

Three mechanisms:

1. Suffocation. A blanket pulled over the face can cause re-breathing of carbon dioxide. Babies under 6 months especially can't pull a blanket off their own face. 2. Strangulation. Loose long blankets can wrap around the neck if the baby rolls and tangles in them. 3. Overheating. Blankets contribute to overheating, which is itself an independent SIDS risk factor.

The combined effect: the AAP estimates that loose bedding is associated with roughly a 5x increase in sleep-related infant death compared to a bare crib with a sleep sack.

The wearable-blanket alternative

TOG-rated sleep sacks (also called wearable blankets) are the workaround. They keep the baby warm without anything loose in the crib:

0.5 TOG: Warm rooms (75°F+)
1.0 TOG: Standard room temperature (70-74°F)
1.5-2.5 TOG: Cool rooms (60-69°F)
3.5 TOG: Very cold rooms (under 60°F — and address the temperature)

The most-recommended brands:

Halo SleepSack — widely available, cotton, 1.0 TOG most common
Kyte Baby — bamboo, soft, multiple TOG options
Woolino — merino wool, all-season (4-season rated for 65-75°F)
Nested Bean Zen Sack — weighted-feeling section across the chest, calming for many babies

For most American homes year-round, a 1.0 TOG sack covers most nights with a long-sleeve onesie underneath. Add a cotton swaddle/muslin in cooler rooms; switch to short-sleeve underneath in warmer rooms.

What about lovies?

A "lovey" — small soft toy or thin attachment item — is a common transitional object kids form attachments to. The safe-sleep timeline for lovies follows blankets:

Under 12 months: Not in the crib while baby is asleep. If a lovey is part of the going-down ritual, hold it during the routine and remove from the crib once baby is asleep.
12-18 months: Some pediatric guidance permits a small thin lovey for older infants — this is in a gray zone
18+ months: Generally fine, with size limits (nothing larger than the baby's head, nothing with strings or detachable parts)

The most common pattern we've seen with friends: introduce a small lovey at 18-24 months, when the kid actually starts forming attachments to objects. Trying to introduce one at 6 months mostly produces a piece of fabric the baby ignores.

After the first birthday: what's actually safe

At 12-18 months, what's appropriate to add to the crib:

Small thin blanket — flat, lightweight, no larger than a pillowcase. Cellular (woven) baby blankets work well
Small lovey or comfort toy — head-sized or smaller, no detachable parts
Possibly a thin pillow at 18-24 months — many pediatricians say wait for the toddler bed

What's still not safe at 12-18 months:

Adult-sized blankets or comforters
Heavy quilts
Weighted blankets at any age before pediatric clearance (and for typically-developing kids, weighted blankets aren't recommended at all in cribs)
Crib bumpers (federally banned in 2022 — if you have an old set, throw them out)
Stuffed animals piled in the crib
Pillows of any kind under 12 months

Weighted blankets specifically

The FDA and AAP have been clearer on this: no weighted blankets in cribs, ever, regardless of age. The risk is suffocation if the baby ends up under it, particularly in the first 12 months when the baby can't move it off. For kids 24+ months in a toddler bed, weighted blankets are sometimes recommended for sensory needs — talk to a pediatrician about appropriate weight (typically no more than 10% of the child's body weight) and design.

How to know your baby is actually warm enough without a blanket

The top question new parents have: "how do I keep them warm without a blanket?" The TOG sleep sack does this. Practical check:

Feel the baby's chest or back of neck (not hands or feet — peripheral cooling is normal)
Warm and dry: appropriately dressed
Hot and damp: too warm; remove a layer
Cool: add a layer (or put baby in a higher-TOG sack)
Cold to touch: significantly underdressed; address immediately

Most couples figure out the right TOG within a week of starting. Once you've calibrated for your house, the system runs itself.

When to transition out of the sleep sack

As the baby moves toward toddlerhood, the sleep sack typically stops working around 24-30 months. Signs:

Baby actively unzips or escapes the sack
Baby begins climbing out of the crib
Baby is in a toddler bed and wants to use a regular blanket

At that point, the transition to a regular thin blanket in a toddler bed is straightforward. By then the safety profile has changed enough that loose bedding isn't the same risk.