By Sarah Mitchell
Creator, The Helping Babies Sleep Method | Certified Baby Sleep Consultant | Certified Lactation Counselor
This post is for parents of newborns, infants, and toddlers up to age 3 who are wondering when it is safe to introduce a blanket and what sleep-safe alternatives to use in the meantime.
The Short Answer
Babies should not sleep with a loose blanket until at least 12 months of age, according to the American Academy of Pediatrics (AAP) Safe Sleep guidelines. Before 12 months, a wearable blanket or sleep sack is the safest and most practical alternative to keep your baby warm overnight. Even after 12 months, a sleep sack remains the better choice — and I'll explain exactly why below.
What the AAP Safe Sleep Guidelines Actually Say
The American Academy of Pediatrics (AAP) recommends that infants under 12 months sleep on a firm, flat surface with no loose bedding, blankets, pillows, or bumper pads in the crib. These guidelines are part of the AAP's broader Safe Sleep campaign, which exists to reduce the risk of Sudden Infant Death Syndrome (SIDS) and other sleep-related infant deaths.
The AAP specifically advises against:
- Loose blankets of any kind in the sleep space before 12 months
- Bumper pads in the crib at any age
- Pillows before age 2
These are not overly cautious suggestions — they are evidence-based recommendations built on decades of infant safety research. As a Certified Baby Sleep Consultant, I follow them closely with every family I work with.
Why Is a Blanket Unsafe for a Baby Under 12 Months?
Even placing a blanket over just the lower half of your baby's body carries risk. Babies move during sleep and can kick a blanket up over their face. Before 12 months, most babies do not yet have the motor control or strength to move a blanket away from their airway if it covers their face. The two primary risks are suffocation and strangulation.
This applies to all loose bedding — including lightweight muslin blankets, swaddle blankets used loosely, and crib quilts. If it is loose in the crib, it is not safe.
What to Use Instead of a Blanket: Sleep Sacks Explained
You do not need a loose blanket to keep your baby warm at night. A wearable blanket — commonly known as a sleep sack — is the safest and most effective alternative at every age from newborn through toddler years.
Sleep sacks zip or snap around your baby so there is nothing loose in the crib. They cannot be kicked off, pulled over the face, or tangled around limbs. They are the single item I recommend to every family I work with, regardless of the season.
Choosing the Right Sleep Sack: Understanding TOG Ratings
Sleep sacks are rated by TOG — a standardized measure of thermal insulation. Choosing the right TOG for the season and your home's temperature makes a significant difference in how well your baby sleeps overnight.
Here is a simple guide:
TOG 0.5 — Suitable for warm rooms above 75°F (24°C). Ideal for summer months. A 100% cotton sleep sack like the Woolino Cotton Summer Weight sack works well in this range.
TOG 1.0 — Suitable for rooms between 69–74°F (20–23°C). A good year-round option in temperature-controlled homes.
TOG 2.5 — Suitable for cooler rooms between 61–68°F (16–20°C). Ideal for winter months. A 100% merino wool sleep sack like the Woolino Merino Wool sack provides excellent natural temperature regulation for winter nights.
Room temperature is one of the most overlooked factors in infant sleep quality — and getting your TOG right is one of the easiest wins available to sleep-deprived parents.
You can also layer snug-fitting clothing underneath a sleep sack for extra warmth in very cold conditions. For a full breakdown of how to dress your baby for sleep in every season, read my post: How to Dress My Baby for Winter Sleep.
🔗Read more How to Dress My Baby for Winter Sleep→
When Can My Baby Sleep With a Blanket?
At 12 months your baby can technically sleep with a blanket, but I still recommend continuing with a sleep sack — here is why.
Toddlers kick blankets off in the night constantly. When your child gets cold in the early hours of the morning, they wake up. This matters more than most parents realize. Body temperature naturally drops around 5 am, and this is also one of the most common windows for early wake ups in babies and toddlers.
A sleep sack eliminates this variable entirely because it cannot be kicked off. If your child is waking consistently between 4:30 and 6 am, being cold in the early morning hours may be a contributing factor — and switching to or staying in a sleep sack is one of the first things I address with families dealing with early wake ups.
I kept both of my own children in sleep sacks until age 2.5 when we transitioned them to a toddler or twin bed. At that point a sleep sack with leg holes — sometimes called a footed sleep sack or wearable blanket with legs — gives your child more mobility while still keeping them covered overnight.
On the question of cribs — I recommend keeping your child in a crib until at least 2.5 years of age. Moving a toddler to a bed too early is one of the most common causes of what I call a "jack in the box sleeper" — a toddler who gets out of bed repeatedly and cannot settle independently.
Of all the sleep sacks I recommend to families, the Woolino consistently sits at the top of my list — and the reason comes down to the material. Woolino sleep sacks are made from 100% merino wool, which is naturally temperature regulating in a way that synthetic fabrics simply cannot replicate. Merino wool keeps your baby warm when the room is cool and releases heat when it gets warmer — which means it works across seasons and handles those unpredictable shoulder months when the temperature swings overnight. It is also naturally moisture-wicking, so if your baby sweats during sleep the wool pulls that moisture away from their skin rather than trapping it. On top of all of that, Woolino's universal sizing fits babies from around 2 months up to 2 years old, which means you are not replacing sleep sacks every few months as your baby grows. It is a higher upfront investment than a basic cotton sleep sack, but for a product your baby wears every single night, the quality and longevity make it genuinely worth it. It is the one sleep sack I recommend without hesitation regardless of the season.
Quick Summary
- No loose blankets in the crib before 12 months — this is the AAP Safe Sleep guideline
- Use a sleep sack from newborn onwards as the safest and most practical alternative
- Choose your TOG based on room temperature — not just the season
- Even after 12 months, sleep sacks are better than loose blankets because they cannot be kicked off
- Being cold in the early morning is a common and overlooked cause of early wake ups
- Keep your child in a crib until at least 2.5 years of age
Frequently Asked Questions
When can my baby sleep with a blanket?
According to the American Academy of Pediatrics, babies should not sleep with a loose blanket until at least 12 months of age. Before 12 months the risk of suffocation is significant. Even after 12 months, a sleep sack is a safer and more practical option because it cannot be kicked off during the night.
What can I use instead of a blanket for my newborn?
A wearable blanket or sleep sack is the safest alternative to a loose blanket for newborns and infants. It keeps your baby warm without any loose material in the crib. Layer snug-fitting clothing underneath for extra warmth in cold weather.
Is a sleep sack safe for a 6 month old?
Yes. Sleep sacks are safe from newborn age onwards and are the recommended alternative to loose blankets for all babies under 12 months. Choose a TOG rating appropriate for your room temperature and make sure the neck opening fits snugly so your baby cannot slip inside.
What TOG rating sleep sack do I need for winter?
For cooler rooms between 61–68°F (16–20°C), a TOG of 2.5 is appropriate for winter. A 100% merino wool sleep sack provides excellent natural temperature regulation. If your home is well heated overnight and stays above 69°F, a TOG of 1.0 may be sufficient even in winter months.
When can my toddler sleep with a pillow?
The AAP recommends waiting until age 2 before introducing a pillow. There is no developmental rush — most toddlers sleep comfortably without one well into their second year. Pillows are designed for two reasons. The first is for side sleepers - to keep the entire spine in a neutral position without angles. The second, for back sleepers to gently flex the head to minimize open mouth breathing. Most toddlers don’t have these issues.
Why does my baby wake up at 5am?
Early wake ups between 4:30 and 6 am are one of the most common sleep challenges I work on with families. Being cold is one frequently overlooked cause — body temperature drops naturally in the early morning hours and if your baby has kicked off their blanket, the cold can pull them into a full wake up. A sleep sack eliminates this variable. For a full breakdown of early wake up causes and solutions, read my dedicated early wake up post.
🔗Read more on Early Wake Ups→
Can a 1 year old sleep with a blanket?
Technically yes — the AAP guideline is 12 months. But I still recommend a sleep sack at age 1 because toddlers kick blankets off repeatedly overnight, which leads to cold-related wake ups. A sleep sack with more generous sizing for a growing toddler is the more practical choice.
What is the safest sleep environment for a baby?
The AAP recommends a firm, flat sleep surface with a fitted sheet only — no loose blankets, pillows, bumper pads, or positioners. A wearable blanket or sleep sack is the recommended way to keep your baby warm. Room temperature should be kept between 68–72°F for optimal and safe sleep.
Sarah Mitchell is the Creator of The Helping Babies Sleep Method and a Certified Baby Sleep Consultant and Certified Lactation Counselor. She helps exhausted parents build healthy, safe sleep habits for their babies and toddlers.
Are You Dealing With a Toddler Who Won't Stay in Bed?
Check out my Toddler Sleep Terrorism Guide — it covers exactly what to do when bedtime becomes a battle.
📖 Read more: How to Dress My Baby for Winter Sleep
📖 Read more: Why Is My Baby Waking at 5am?
📖 Read more: Toddler Sleep Terrorism Guide
