Cold weather changes the way your baby’s room holds heat, moves air, and maintains comfort overnight. Adults can pull on an extra blanket or adjust their own thermostat habits without much thought. Babies cannot do any of that. They rely entirely on the room around them, and a nursery that felt fine in October can become a problem by December if you have not made a few adjustments. Here is what to check, fix, and add before winter sets in.
Set the Right Temperature Range
The widely cited safe range for a baby’s room is 68 to 72°F (20 to 22°C). The American Academy of Pediatrics recommends dressing babies appropriately for room temperature and avoiding overheating, which is a recognized risk factor for SIDS. That range works as a practical target because it keeps most infants comfortable in a sleep sack or one-piece sleepwear without extra blankets.
Babies cannot regulate their own body temperature the way adults can. Their surface area relative to body weight is larger, and they lose heat faster through exposed skin. They also cannot shiver effectively in the first few months. This means the room does most of the work, and getting the temperature wrong in either direction, too hot or too cold, affects sleep quality and safety more than most parents realize.
Use a Room Thermometer
Your home’s main thermostat tells you what the hallway or living room temperature is. It does not tell you what is happening in the nursery, especially if the nursery is on a different floor, at the end of a hallway, or near an exterior wall. A simple room thermometer placed on the dresser or mounted on the wall gives you an actual reading of the space where your baby sleeps. Digital models that display both temperature and humidity cost under twenty dollars and remove the guesswork entirely.
Check for Drafts Before the Cold Arrives
Cold air leaks in through gaps you might not notice during warmer months. Check around window frames, door seals, baseboards, and any wall seams where drywall meets trim. Hold your hand near these areas on a cold day and you will feel the draft if one exists. Weather stripping around doors and windows is inexpensive and takes minutes to install. Draft stoppers at the base of doors help too, especially if the nursery door stays closed at night.
Position the Crib Carefully
Where you put the crib in the room matters more in winter than in summer. Keep it away from exterior walls that get cold, out of direct line with windows, and not directly over or under a heating vent. A vent blowing warm air straight onto the crib can overheat your baby quickly, and one that cycles on and off creates temperature swings throughout the night. The safest spot is an interior wall away from both drafts and direct heat sources.
Layer Clothing Instead of Adding Blankets
The AAP advises against loose blankets in the crib for infants under 12 months because of suffocation risk. Instead, dress your baby in layers. A common guideline is to put your baby in one more layer than you would wear to sleep comfortably in the same room. A cotton onesie under a fleece or cotton sleep sack works well for most nurseries in the 68 to 72°F range. If the room runs cooler, a long-sleeve bodysuit under a heavier-weight sleep sack adds warmth without loose fabric in the crib. The fabric you choose for those layers matters too, and we cover that along with other baby comfort topics on our home page.
Add a Humidifier
Winter heating systems dry out indoor air. That dry air can irritate a baby’s nasal passages, cause dry skin, and make congestion worse when colds hit. A cool-mist humidifier in the nursery helps keep humidity in the 40 to 60 percent range, which is comfortable for breathing and sleep. Avoid warm-mist humidifiers in a baby’s room because of the burn risk if the unit tips over. Clean the humidifier regularly, at least every few days, to prevent mold and bacteria from building up in the water tank.
Reverse Your Ceiling Fan
If the nursery has a ceiling fan, check the direction it spins. In summer, fans should run counterclockwise to push air down and create a cooling breeze. In winter, switch the fan to clockwise at a low speed. This pulls cool air up and pushes warm air that has risen to the ceiling back down along the walls and into the room. It will not create a noticeable breeze on your baby, but it helps distribute heat more evenly so the room does not end up warm near the ceiling and cold at crib level.
Think Beyond Winter
Most of these steps, the thermometer, the crib placement, the layering habits, apply year-round with small seasonal adjustments. Winter is when parents tend to notice problems first because cold spots and drafts are hard to ignore. But overheating in summer is just as real a concern. If you want to keep the nursery stable across all four seasons, we wrote a separate guide on keeping your nursery at a consistent temperature all year that covers thermostat strategies, insulation, and window treatments that help year-round.