Welcoming a newborn into your life is a joyous yet overwhelming experience, especially when it comes to ensuring their safety and comfort during sleep. One essential item that often puzzles new parents is the baby sleeping bag (also called a sleep sack). Unlike loose blankets, which pose suffocation risks, sleep sacks provide a secure, wearable layer to keep babies cozy. However, not all sleep sacks are created equal—their warmth depends on their TOG rating (Thermal Overall Grade).
In this guide, we’ll break down everything you need to know about TOG ratings, how to match them to your baby’s needs, and practical tips from trusted child safety organizations.
What Is a TOG Rating?
TOG measures the thermal resistance of fabric, indicating how effectively a material traps heat. Developed in the UK, the TOG system is widely used for baby sleep products. A higher TOG value means better insulation, suitable for colder environments, while lower TOG ratings are ideal for warmer conditions.
According to the Lullaby Trust, a UK-based infant safety charity, using a TOG-rated sleep sack helps parents avoid overheating—a known risk factor for Sudden Infant Death Syndrome (SIDS) (Lullaby Trust, 2023).
Why TOG Matters for Your Baby’s Sleep
Newborns struggle to regulate their body temperature, making them vulnerable to both chilling and overheating. The American Academy of Pediatrics (AAP) emphasizes that babies sleep safest in a room kept between 68–72°F (20–22°C), dressed in no more than one layer more than an adult would wear (AAP, 2022).
A TOG-rated sleep sack takes the guesswork out of layering. For example:
A 1.0 TOG sack in a 70°F room may only require a lightweight onesie.
A 2.5 TOG sack in a 65°F room might pair with long-sleeved pajamas.
Safety Tips from Experts
Avoid Add-Ons: Skip hats, socks, or blankets inside the sack. The AAP notes that heads are critical for temperature regulation (AAP, 2022).
Watch for Overheating: Feel the back of the neck—if sweaty, switch to a lower TOG.
Size Appropriately: A too-large sack can cover the face; too-small ones hinder hip development.
Common TOG Questions Answered
Q: Can I layer two low-TOG sleep sacks for extra warmth?
A: No. Layering restricts movement and increases overheating risks. Instead, dress your baby in a thermal onesie under the sack.
Q: Are TOG ratings standardized globally?
A: While most brands follow the UK TOG system, check individual product guidelines. European sleep sacks may use “tog” scales differently.
Q: When should I stop using a sleep sack?
A: Most transition to blankets around 12–18 months, but continue using a sack if your toddler climbs out of bedding.
Key Takeaways
TOG ratings simplify dressing your baby for sleep while reducing SIDS risks.
Match the TOG value to your nursery’s temperature, not the weather outside.
Always prioritize fit and fabric breathability over thickness.
By understanding TOG ratings, you’ll create a safer, cozier sleep environment for your little one—and gain peace of mind as a new parent.
NOTE:how to check if baby is too hot
Check baby’s chest nad or back of their neck to make sure their skin doesn’t feel clammy or sweaty to the touch,(their hands and feet will always feel cold to touch.)Warm is fine but if feels sweaty to clammy it means they are too hot so remove a layer of bedding or clothing. This is just a rough guide provided by Housbay.All babies are different-check regularly.
