Keeping a newborn warm in winter comes down to layering smartly, maintaining the right room temperature, and avoiding a few common mistakes that can actually put your baby at risk. The target temperature for your baby’s room is between 68 and 72°F (20 to 22°C), and the simplest rule for dressing your baby is one more layer than what you’re comfortably wearing.
Set the Right Room Temperature
The American Academy of Pediatrics recommends keeping your baby’s room between 68 and 72°F. That range might feel slightly cool to you, and that’s fine. Babies sleep more safely in a room that’s comfortably cool rather than warm, because overheating is a risk factor for SIDS.
If your home runs cold in winter, a space heater can help, but keep it well away from the crib and turn it off before you go to sleep. A simple room thermometer near the crib takes the guesswork out of monitoring. If the room stays below 68°F despite your efforts, you can compensate with what your baby wears to bed.
Layering Clothes During the Day
The NHS recommends giving your baby one extra layer of clothing compared to what you’re wearing. If you’re comfortable in a T-shirt and sweater, your baby should be in a bodysuit (onesie), a sleepsuit or footed pajamas, and a cardigan or light sweater on top. This “plus one” rule works well because newborns can’t regulate their body temperature as efficiently as adults. They lose heat quickly through their heads and extremities, so a hat and socks or booties help when the house is drafty or you’re heading outside.
Stick with breathable fabrics like cotton or merino wool. Synthetic materials can trap moisture against the skin and make your baby clammy rather than warm. Thin, snug layers work better than one thick, bulky layer because they trap warm air between them and are easy to remove if your baby starts getting too hot.
Safe Sleep Warmth: Skip the Blankets
The AAP is clear on this: keep loose blankets, pillows, stuffed toys, and bumpers out of your baby’s sleep space. That means no quilts, no comforters, and no tucking a blanket around your baby in the crib, no matter how cold it is. Loose bedding is a suffocation risk.
The safe alternative is a wearable blanket, often called a sleep sack. These zip or snap on and can’t ride up over your baby’s face. Sleep sacks are rated using a system called TOG, which measures thermal resistance. Here’s how to match the rating to your room temperature:
- 0.5 TOG: Best for warmer rooms, 74 to 78°F
- 1.0 TOG: Good for moderate rooms, 69 to 73°F
- 2.5 TOG: Designed for cooler rooms, 61 to 68°F
If your nursery hovers around 68°F in winter, a 1.0 TOG sleep sack over a long-sleeved onesie is usually enough. If the room dips into the low 60s, move to a 2.5 TOG sack. Underneath, a cotton bodysuit and footed pajamas provide a solid base layer. Avoid hats for sleep since they can slip and become a hazard.
How to Check if Your Baby Is Too Cold or Too Hot
Don’t rely on your baby’s hands and feet to gauge temperature. They’re almost always cooler than the rest of the body, especially in newborns, and that’s normal. Instead, touch the back of your baby’s neck. If the skin there feels warm and dry, your baby is comfortable. If it’s sweaty or hot, remove a layer. If it feels cool, add one.
Signs of overheating include flushed cheeks, sweating, damp hair, and rapid breathing. A baby who’s too cold may seem unusually still or sluggish, with hands and feet that feel genuinely icy rather than just cool. Overheating is actually the more common winter mistake, because parents tend to overdress babies for sleep. When in doubt, lean slightly cooler rather than warmer.
Car Seat Safety in Winter
This catches a lot of parents off guard: bulky winter coats should not be worn under a car seat harness. The National Highway Traffic Safety Administration warns that thick padding compresses on impact, creating slack in the harness straps. That extra room means the straps can’t hold your baby securely in a crash.
Instead, buckle your baby into the car seat in thinner clothing, tighten the harness snugly, and then place a blanket or coat over the top of the buckled harness. Some parents warm the car first so the baby doesn’t need heavy outerwear at all. You can also buy thin fleece car seat covers that fit over the seat without interfering with the straps.
Going Outside in Cold Weather
Short trips outside are fine for most newborns, but pediatricians at Riley Children’s Health recommend avoiding or minimizing outdoor time when the temperature or wind chill drops below freezing (32°F / 0°C). Newborns lose body heat rapidly, and their small size means they can get dangerously cold faster than an older child or adult.
When you do go out, dress your baby in layers: a bodysuit, a warm outfit, a hat that covers the ears, mittens, and a bunting or snowsuit. For stroller trips, use a weather shield designed for your stroller model rather than draping a blanket or scarf over the opening. Research has shown that covering a stroller with even a thin fabric can cause the interior temperature to spike dramatically, rising from 72°F to nearly 99°F in under an hour, while also restricting airflow. Poor ventilation increases the risk of overheating and carbon dioxide buildup. A purpose-built weather shield maintains visibility, allows air circulation, and blocks wind and rain.
Bathing a Newborn in Winter
You don’t need to bathe your newborn every day. Three times a week is plenty until your baby becomes more mobile, and less frequent bathing helps prevent the dry, cracked skin that winter air can cause. When you do bathe, aim for water temperature around 100°F (38°C). Test it with your elbow or the inside of your wrist since those areas are more sensitive than your fingertips.
Make sure the room is warm before you undress your baby. A wet newborn chills fast. Have a towel, a fresh diaper, and warm clothes ready within arm’s reach so you can dry and dress your baby quickly after the bath. If your baby’s skin is looking dry or flaky, a fragrance-free baby moisturizer applied right after toweling off helps lock in moisture while the skin is still slightly damp.
Keeping the Air Comfortable
Winter heating systems dry out indoor air, which can irritate your baby’s skin and nasal passages. A cool-mist humidifier in the nursery helps maintain comfortable humidity levels. Clean it regularly to prevent mold growth. If you notice your baby sounds congested or has dry, cracked skin around the nose or cheeks, low humidity is a likely contributor.
Keep the crib away from drafty windows, exterior walls, and heating vents. Direct blasts of warm air from a vent can overheat your baby on one side while the rest of the room stays cool, making it hard to dress them appropriately. A spot in the center of the room or along an interior wall is ideal.