How should I dress my baby for cold weather outside?

Dress your baby in one more layer than an adult would wear in the same conditions, using several thin layers rather than one thick coat, plus a hat and mittens. Remove a layer once you are back in a heated indoor space.

Can my baby use a blanket to stay warm at night?

No. Keep blankets, quilts, and other loose bedding out of the sleep area because of suffocation risk. Use a wearable blanket or sleep sack, or add one more layer of clothing instead.

How do I know if my baby is too hot while sleeping?

Feel the chest, back, or nape of the neck rather than the hands and feet. Sweating, damp hair, flushed skin, a hot chest, or rapid breathing mean your baby is overheated and needs a layer removed.

What TOG sleep sack should I use in winter?

Match TOG to the room temperature: about 1.0 TOG for 68–72°F, 2.5 TOG for a cooler 61–68°F room, and 3.5 TOG below about 61°F. Choose based on the room, not the outdoor weather.

Should my baby wear a hat to sleep in winter?

No. Once you are home from the hospital, do not put a hat on your baby for sleep. Hats indoors can cause overheating, which raises SIDS risk. Use a sleep sack and a comfortable room temperature instead.

Why is overheating dangerous for a sleeping baby?

Overheated babies are at higher risk for SIDS and heat-related death. Avoid overbundling, keep the room at 68–72°F, skip loose bedding and indoor hats, and check the chest for warmth.

Winter safety · 0–3 yr

Layer up by day, sleep sack by night.

Cold-weather dressing has two settings: thin layers you can add and remove during the day, and a single safe layer for sleep. The most common winter mistake is overbundling at bedtime.

2 min read Seasonal Safety Updated June 2026

Daytime layering: one more than you

For older babies and young children, the rule of thumb is to dress them in one more layer of clothing than an adult would wear in the same conditions.

Several thin layers keep your child warmer and drier than one thick one, and they let you add or remove a layer as you move between cold outdoors and heated indoors. Add warm boots, mittens, and a hat for time outside.

Base layer: a snug long-sleeved bodysuit or thermal top
Middle layer: fleece for insulation
Outer layer: a weather-resistant coat for outdoors
Hat and mittens whenever you head outside

Safe sleep in winter: less is more

Keep blankets, quilts, pillows, bumpers, sheepskins, and other loose bedding out of the sleep area at all times. Loose bedding is a suffocation hazard.

To keep your baby warm without loose bedding, use a wearable blanket or sleep sack, or add one more layer of clothing. Once you are home from the hospital, do not put a hat on your baby for sleep, because hats indoors can cause overheating.

Room temperature and sleep sack warmth

Keep the room at a temperature that is comfortable for a lightly dressed adult, commonly 68 to 72°F. Use a room thermometer rather than guessing.

Sleep sacks are rated by TOG, a measure of warmth. Match the TOG to the room temperature, not the outdoor weather.

0.5 TOG for a warm room around 75°F or higher
1.0 TOG for roughly 68–72°F
2.5 TOG for a cooler room around 61–68°F
3.5 TOG for below about 61°F

Watch for overheating

An overbundled baby can overheat, and overheating raises the risk of SIDS. Check the chest, back, or nape of the neck to judge whether your baby is warm enough. Hands and feet run cooler than the core and are not a reliable guide.

Signs your baby is too hot include sweating, damp hair, flushed skin, a chest that feels hot to the touch, and rapid breathing. If you see these, remove a layer.

Common questions

How should I dress my baby for cold weather outside?: Dress your baby in one more layer than an adult would wear in the same conditions, using several thin layers rather than one thick coat, plus a hat and mittens. Remove a layer once you are back in a heated indoor space.
What temperature should a baby's room be in winter?: Keep the nursery at a temperature comfortable for a lightly dressed adult, commonly 68 to 72°F. Use a room thermometer and match the sleep sack warmth to that temperature.
Can my baby use a blanket to stay warm at night?: No. Keep blankets, quilts, and other loose bedding out of the sleep area because of suffocation risk. Use a wearable blanket or sleep sack, or add one more layer of clothing instead.
How do I know if my baby is too hot while sleeping?: Feel the chest, back, or nape of the neck rather than the hands and feet. Sweating, damp hair, flushed skin, a hot chest, or rapid breathing mean your baby is overheated and needs a layer removed.
What TOG sleep sack should I use in winter?: Match TOG to the room temperature: about 1.0 TOG for 68–72°F, 2.5 TOG for a cooler 61–68°F room, and 3.5 TOG below about 61°F. Choose based on the room, not the outdoor weather.
Should my baby wear a hat to sleep in winter?: No. Once you are home from the hospital, do not put a hat on your baby for sleep. Hats indoors can cause overheating, which raises SIDS risk. Use a sleep sack and a comfortable room temperature instead.
Why is overheating dangerous for a sleeping baby?: Overheated babies are at higher risk for SIDS and heat-related death. Avoid overbundling, keep the room at 68–72°F, skip loose bedding and indoor hats, and check the chest for warmth.

Sources & further reading

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This guide reflects current AAP, CDC, and other public-health guidance and is for educational purposes only. It does not constitute medical advice. ParentFlow is a wellness companion — not a substitute for your pediatrician. For any medical concern, contact your healthcare provider.