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Time to read 14 min
At 70–72°F, use a long-sleeve cotton onesie. For warmer 74–75°F rooms, a short-sleeve onesie or just a diaper under a thin muslin swaddle is safest to prevent overheating.
Aim for a 0.6 to 1.2 TOG rating. Use 1.0–1.2 TOG for the cooler end (70–72°F) and a lighter 0.5–0.6 TOG for the warmer end (74–75°F).
Place two fingers gently on the nape of their neck. If the skin feels hot, sweaty, or damp, they are too warm. Never check their hands or feet, which naturally feel cool.
You must stop swaddling and transition to a wearable, sleeveless sleep sack as soon as your baby shows signs of rolling over (typically 3 to 4 months) to prevent suffocation risks.
When the house is between 70 and 75 degrees Fahrenheit, dress your baby in one breathable base layer, such as a short-sleeve or long-sleeve 100% cotton onesie, paired with a 0.6 to 1.2 TOG sleep sack. Skip loose blankets entirely, as they pose a suffocation and overheating risk for babies under 12 months. The right combination of clothing and TOG rating keeps your baby safe, comfortable, and sleeping soundly all night long.
Knowing what a baby should wear to bed when the house is 70 to 75 degrees is one of those questions that catches nearly every new parent off guard. Because babies under 12 months cannot regulate their own body temperature, they rely entirely on you to make the right call every night. This guide covers TOG ratings, age-specific layering, the best fabrics for this temperature zone, and how to check your baby's comfort once they are down, so the whole family can sleep well with Baby DeeDee.
Most Canadian homes sit between 70 and 75 degrees Fahrenheit during spring, fall, and in air-conditioned rooms throughout summer. To an adult, this temperature feels comfortable. For a sleeping baby, it creates a real layering puzzle.
The 70 to 75 degree range is tricky because 70 degrees and 75 degrees are not the same experience for an infant. According to the American Academy of Pediatrics (AAP), the ideal nursery temperature for safe infant sleep falls between 68 and 72 degrees Fahrenheit. A room at 70 degrees sits comfortably within that range, while 74 or 75 degrees pushes toward the upper limit, where overheating risk increases.
Babies also lose body heat rapidly because their skin surface area is large relative to their body weight. They sweat primarily through the head and neck rather than the torso. This means overdressing causes heat to build up without an efficient way to escape.
According to the CDC, overheating during sleep is a recognised risk factor for Sudden Infant Death Syndrome (SIDS). Getting your baby's layers right is a safety priority, not just a comfort preference.
Your goal is to keep your baby in their thermoneutral zone. In this state, their body does not work extra hard to warm up or cool down, and all of their energy goes toward growth, brain development, and deep, restorative sleep.
TOG stands for Thermal Overall Grade. It is a standardised measure from the textile industry that tells you how much warmth a sleep sack provides. The higher the TOG number, the more body heat the garment retains.
The Sleep Foundation notes that babies sleep best in rooms between 68 and 72 degrees Fahrenheit. Within the 70 to 75 degree range, you need a sleep sack rated between 0.6 and 1.2 TOG. Winter-weight 2.5 TOG sacks are too warm, and ultra-thin 0.2 TOG options work better in rooms above 80 degrees.
Here is a clear TOG overview to guide your choice:
TOG Rating |
Warmth Level |
Recommended Room Temperature |
0.5 to 0.6 |
Lightweight |
74 to 80°F (23 to 27°C) |
1.0 to 1.2 |
Mid-weight |
68 to 73°F (20 to 23°C) |
2.0 to 2.5 |
Heavy/Winter |
61 to 68°F (16 to 20°C) |
3.5 |
Warmest/Outdoor |
Below 61°F (16°C) |
Keep in mind that the TOG of the sleep sack and the clothing underneath work together as a total system. A heavier TOG sack means fewer clothes underneath. A lighter sack may need a slightly warmer base layer.
Knowing what a baby should wear to bed when the house is 70 to 75 degrees becomes much clearer when you break the range into specific temperature points.
Recommended outfit:
Long-sleeve 100% cotton onesie as the base layer
1.0 to 1.2 TOG sleep sack on top
A long-sleeve onesie protects your baby's arms and torso from the slight chill. A 1.2 TOG sleep sack wraps them in reliable, breathable warmth. Avoid adding footie pyjamas on top of the onesie under a 1.2 TOG sack, as three layers in this range will likely cause overheating by early morning.
Recommended outfit:
Short-sleeve or long-sleeve cotton onesie
0.6 to 1.0 TOG sleep sack
This is the sweet spot for baby sleep layering in most Canadian homes. A single onesie and a mid-weight sleep sack give the right balance of warmth and airflow. Choose the short-sleeve onesie for babies who tend to run warm, and the long-sleeve version for those who run cool.
Recommended outfit:
Short-sleeve cotton onesie, or diaper only for warm-running babies
0.5 to 0.6 TOG sleep sack
At this temperature, breathability is your top priority. A lightweight 0.5 to 0.6 TOG sleep sack replaces a loose blanket safely while giving your baby the cosy, contained feeling that promotes better sleep. If your home consistently reaches 75 degrees at night, run a fan pointed away from the crib to improve airflow.
Review Baby DeeDee's safe sleep guidelines for more on setting up a safe nursery environment.
Newborns are the most vulnerable group when it comes to temperature regulation. In the first three months of life, your baby cannot shiver to generate warmth or sweat effectively to cool down. They have very little body fat for insulation and stay nearly still during sleep.
A practical starting rule: dress your newborn in one more layer than you would wear comfortably in the same room. Keep in mind that a swaddle counts as an additional layer.
For a room at 74 to 75 degrees:
Short-sleeve cotton onesie as the base layer
Thin, single-layer cotton muslin swaddle on top
No additional clothing layers
For a room at 70 to 72 degrees:
Long-sleeve cotton footie pyjamas
1.0 TOG transitional swaddle sack on top
Once your baby shows signs of rolling, typically between three and four months, you must stop swaddling immediately. According to the AAP's guidelines on swaddling, a swaddled baby who can roll faces a serious suffocation risk. That is the moment to move to a wearable sleep sack.
Always use 100% cotton for your newborn's base layer. Natural fibres breathe well and absorb light moisture without trapping heat. Browse Baby DeeDee's newborn sleep nest collection to find the right TOG, and explore the full Baby DeeDee product range while you are there.
Between four and twelve months, your baby develops more body fat, becomes far more active in the crib, and outgrows the need for a swaddle. Because older babies move so much during sleep, they generate more body heat than newborns do.
A six-month-old in a 70-degree room often needs lighter layers than a newborn in the exact same room.
For a room at 74 to 75 degrees:
Short-sleeve cotton onesie
0.5 to 0.6 TOG sleep sack
For a room at 70 to 72 degrees:
Long-sleeve cotton onesie or lightweight cotton footie pyjamas
1.0 to 1.2 TOG sleep sack
Baby DeeDee's baby sleep nest collection features patented shoulder snaps. They let you place a sleeping baby into the sack without bending their arms or waking them during the transfer.
When your baby starts rolling, transition away from the swaddle right away. Read Baby DeeDee's guide on choosing a sleep sack for a rolling baby to handle that milestone with confidence.
One practical tip: choose a sleep sack with a reverse zipper. When a diaper change is needed at night, you unzip from the bottom, change the diaper, and zip back up without fully waking your baby or exposing their chest to cooler air.
Toddlers regulate their body temperature far more efficiently than newborns. They sweat more effectively, have more muscle mass to generate heat, and tend to be active, restless sleepers who run warm.
The NICHD's Safe to Sleep campaign recommends avoiding loose blankets in the crib for as long as possible. A toddler will kick a blanket off within minutes and wake up cold by early morning. A wearable sleep sack solves this completely.
For a room at 74 to 75 degrees:
Short-sleeve cotton onesie or lightweight t-shirt
0.5 TOG toddler sleep sack with ankle openings for safe standing
For a room at 70 to 72 degrees:
Long-sleeve cotton pyjama set
1.0 to 1.2 TOG toddler sleep sack
Look for a toddler sleep sack with an open bottom or ankle cuffs. This lets your toddler stand safely in the crib without tripping. Explore Baby DeeDee's toddler sleep nest collection for options designed with this stage in mind.
If your toddler unzips their sleep sack and removes it in protest, put it on backward. With the zipper at the back, it stays out of reach all night.
In the 70 to 75 degree range, the material touching your baby's skin affects their comfort and safety just as much as the number of layers you choose.
Best fabrics for this temperature range:
100% cotton: Soft, breathable, and moisture-absorbing. Cotton draws light sweat away from the skin and allows it to evaporate, keeping your baby dry and comfortable.
Bamboo viscose: Lightweight, naturally temperature-regulating, and ideal for babies with sensitive skin or eczema.
Cotton muslin: Extremely breathable and best for light swaddles at the warmer end of the range.
Fabrics to avoid as a base layer in this range:
Synthetic polyester or low-grade fleece: These trap moisture and block airflow. In a 72 to 75 degree room, a polyester onesie under a sleep sack quickly creates a warm, humid layer that leads to overheating.
Heavy knit or wool: Too insulating for a base layer in this temperature range.
Baby DeeDee's baby pyjamas collection uses 100% cotton, so your baby stays comfortable no matter how the nursery temperature shifts overnight.
You can also read about common baby sleep mistakes to make sure your full bedtime routine is safe and effective.
No layering chart replaces real-time feedback from your baby's body. Every baby runs slightly differently, so confirm your choice by checking on your baby about 15 to 20 minutes after they fall asleep.
Where to check: Place two fingers gently against the nape of your baby's neck or on their upper back, beneath their sleep sack. This area gives you the most accurate read of their core temperature.
Do not check their hands or feet. A baby's circulatory system naturally limits blood flow to the extremities to protect the core. Cool hands and feet are completely normal and are not a reliable sign that your baby is cold.
According to WebMD, if your baby's chest feels warm to the touch, lower the room temperature or remove a clothing layer. If it feels cool, switch to a slightly heavier sleep sack.
Signs your baby is too hot:
Sweaty or damp skin at the nape of the neck
Flushed or red cheeks
Damp hair along the hairline
Rapid breathing while asleep
Heat rash on the torso or back
Signs your baby is too cold:
Cool skin on the chest or upper back
Frequent waking throughout the night
Persistent fussiness that does not settle easily
Adjust one layer at a time so you can clearly identify what makes the difference. For a full breakdown of what to watch for, read Baby DeeDee's guide on how to tell if your baby is too hot or cold when sleeping.
Use this table as your starting point each night, then confirm with the nape-of-neck check:
Room Temperature |
Base Layer |
TOG Rating |
Recommended Baby DeeDee Product |
70 to 71°F |
Long-sleeve cotton onesie |
1.2 TOG |
Sleep Nest Fleece |
72 to 73°F |
Short or long-sleeve cotton onesie |
0.6 to 1.0 TOG |
Sleep Nest Lite |
74 to 75°F |
Short-sleeve onesie or diaper only |
0.5 to 0.6 TOG |
Sleep Nest Lite or Sleep Nest Basic |
Answering what a baby should wear to bed when the house is 70 to 75 degrees only takes three things: the right TOG for your nursery temperature, a breathable cotton base layer, and a quick neck check once your baby is asleep.
Whether you have a newborn, a rolling six-month-old, or a toddler who kicks off every blanket, the right sleep sack does most of the work. According to the Cleveland Clinic, a baby's sleep environment plays a direct role in SIDS risk. A well-chosen, correctly rated sleep sack is one of the simplest ways to control that environment safely every night.
Skip the loose blankets, choose natural fibres for the base layer, trust the TOG system, and confirm your choice with a gentle touch at the nape of the neck.
Find the perfect sleep sack for your nursery tonight. Shop Baby DeeDee's full collection of TOG-rated sleep nests, designed with patented shoulder snaps and a reverse zipper that make every bedtime and midnight diaper change simpler for you and more comfortable for your baby.
A room at 75 degrees Fahrenheit is on the warmer end of the safe sleep range, as most paediatric experts recommend keeping the nursery between 68 and 72 degrees. If your home reaches 75 degrees at night, dress your baby in a short-sleeve onesie or just a diaper under a lightweight 0.5 TOG sleep sack, and ensure there is good airflow in the room.
If your baby is in a sleep sack that covers their legs, additional socks are generally not necessary and can cause their feet to sweat uncomfortably. If you need extra warmth at 70 degrees, choose cotton footie pyjamas as the base layer instead of adding loose socks, which can come off and become a crib hazard.
A toddler who is too warm will toss and turn aggressively, have damp hair from sweating, or breathe more rapidly while resting. Check the nape of their neck, and if it feels warm and damp, switch to a lighter 0.5 or 1.0 TOG sleep sack right away.
A fleece sleep sack typically carries a 1.2 TOG rating or higher, which is too warm for a 74-degree room and is likely to cause overheating. Save the fleece sleep sack for when the room drops closer to 70 to 72 degrees, and choose a lightweight cotton sleep sack for the warmer end of this range.
A 0.5 TOG sleep sack is lightweight and breathable, similar to a thin cotton bedsheet, and works best for rooms between 74 and 80 degrees. A 1.0 TOG sleep sack adds moderate warmth and is the better fit for rooms between 70 and 73 degrees.
Every baby has a unique metabolism, and some naturally run cooler than average, even at 72 degrees. Check the nape of their neck, and if the skin feels cool to the touch, swap the short-sleeve onesie for a long-sleeve cotton onesie to add a bit more warmth overnight.
Babies release most of their excess body heat through the head and neck, so a sweating head at 71 degrees signals that the clothing underneath is trapping too much warmth. Remove one clothing layer or switch to a lighter TOG sleep sack to allow heat to escape more effectively.
Yes, at 75 degrees, dressing your newborn in just a diaper and wrapping them in a thin cotton muslin swaddle is completely safe and appropriate. The swaddle provides the containment your newborn needs, while skipping the base layer prevents dangerous heat buildup in a warm room.
Most paediatric experts recommend sleeveless sleep sacks because the open armholes allow body heat to vent efficiently, which is an important safety feature in moderate to warm rooms. If you are concerned about your baby's arms feeling cool at 70 degrees, dress them in a long-sleeve cotton onesie underneath a sleeveless sack instead of adding a sleeved sack on top.
The AAP recommends keeping the crib free of loose blankets for the entire first year of life, and most experts suggest continuing with a wearable sleep sack well into the toddler years. You can safely make the switch to a standard blanket once your child moves into a toddler bed and can pull the covers back over themselves if they come off.
