Is my baby too hot? Too cold? Just right? If you’ve ever stood over the crib doing a full-body temperature check on your sleeping baby, you know exactly what I’m talking about. Figuring out how to dress your little one for sleep is one of those things that sounds simple but can send you down a rabbit hole of conflicting advice fast.
That’s where TOG ratings come in, and once you understand this one concept, you’ll feel so much more confident at bedtime.
What Is a TOG Rating?
TOG stands for Thermal Overall Grade. It’s a unit of measurement that tells you how warm a piece of sleepwear or bedding will keep your baby. The higher the TOG number, the warmer the item. Lower TOG means lighter and cooler.
TOG ratings are most commonly used for sleep sacks (also called wearable blankets), which are the safest alternative to loose blankets in the crib. Using a sleep sack with the right TOG for your room temperature means your baby stays comfortable all night without you needing to worry about blankets bunching up or covering their face.
The ideal room temperature for infant sleep is between 68 and 72 degrees Fahrenheit (20 to 22 degrees Celsius). TOG ratings help you dress your baby appropriately for wherever your home lands within or outside that range.
The TOG Rating Breakdown
Here’s a simple guide to help you match the room temperature to the right TOG and what to put underneath:
| Room Temp | TOG Rating | What to Wear Underneath | Notes |
| 75°F+ (24°C+) | 0.2 TOG | Diaper only or short-sleeve onesie | Warm rooms / summer |
| 68–74°F (20–23°C) | 1.0 TOG | Short-sleeve bodysuit | Standard indoor temp, sweet spot |
| 61–68°F (16–20°C) | 1.5–2.5 TOG | Long-sleeve bodysuit + footed pants | Cooler homes, transitional seasons |
| Below 61°F (16°C) | 2.5–3.5 TOG | Full footie pajamas | Cold rooms / winter |
Why This Matters for Sleep (and Safety)
Temperature regulation is one of the most important factors in infant sleep, and it also has real safety implications. Overheating is a known risk factor for SIDS. Babies who are too warm may sleep more deeply than is safe, and they can’t kick off a blanket the way adults can.
Using a sleep sack with the right TOG rating removes the guesswork completely. No loose blankets. No checking a dozen times whether they’ve wriggled out of their swaddle. Just the right amount of warmth, built right in.
A cool, dark, and quiet room with appropriately dressed baby is one of the most effective things you can do to support longer, more restorative sleep.
How to Tell If Your Baby Is Too Hot or Too Cold
Rather than checking their hands and feet (which are naturally cooler than the rest of the body), feel the back of your baby’s neck or their chest. That’s where you’ll get an accurate read.
- Too hot: skin feels sweaty or warm to the touch, flushed cheeks, rapid breathing
- Too cold: skin feels cool and mottled, baby is difficult to settle
- Just right: warm and dry, sleeping comfortably
If your baby consistently wakes at the same time every night, temperature is one of the first things I look at. Rooms often cool down significantly in the early morning hours, and a baby who was perfectly dressed at 8 PM might be chilly by 4 AM.
Common Questions About TOG Ratings
Do I need different sleep sacks for different seasons?
Yes, and it’s worth the investment. Having a 0.2 TOG for summer and a 2.5 TOG for winter (plus something in between) means you’re always prepared, no matter what your thermostat is doing.
Can I layer a sleep sack over clothing instead of adjusting the TOG?
You can, but be careful about over-layering. Babies overheat more easily than adults, and it can be hard to tell when you’ve overdone it. The table above accounts for layers, so use that as your guide.
What about swaddles? Do they have TOG ratings too?
Some do. If you’re using a swaddle blanket, it’s worth checking. Swaddle sleep sacks often come in 0.2 to 1.0 TOG options, which is appropriate for most newborns since they tend to be kept in warmer environments and the swaddle adds warmth.
A Small Change That Makes a Big Difference
I know it might seem like a small thing, but so many families I work with discover that a temperature or clothing adjustment is contributing to early wake-ups or frequent night wakings. It’s one of the first things I check when a family comes to me stuck on a problem they can’t figure out.
Getting the environment right, including the right sleep sack, is one of the easiest wins you can give yourself. And when you’re this tired, easy wins matter a lot.
Ready to get your nights back? Book a free discovery call at TinyTransitions.com/Contact and let’s talk about what’s really going on with your little one’s sleep.
