How to Choose the Right TOG Rating for Your Baby's Sleep Bag

Quick Answer

Choose a sleep bag TOG rating based on the temperature of your baby's room: 0.2 TOG for warm rooms above 75°F, 1.0 TOG for 68–75°F, 2.5 TOG for 61–68°F, and 3.5 TOG for cooler rooms below 61°F. Always consider your baby's sleepwear and adjust layers accordingly.

When you start shopping for a baby sleep bag, one of the first things you'll notice is the TOG rating. TOG stands for Thermal Overall Grade, and it measures how warm a fabric is. The higher the TOG, the warmer the sleep bag. Choosing the right TOG is essential for keeping your baby comfortable and safe during sleep, as overheating is a known risk factor for SIDS.

But TOG isn't just about picking a number. You also need to think about the room temperature, what your baby wears underneath, and how your baby sleeps. This guide breaks down the TOG scale, gives you clear decision rules, and explains how to adjust as seasons change.

What Does TOG Mean?

TOG is a unit of thermal insulation. In the context of baby sleep bags, it tells you how much warmth the bag provides. A lower TOG (like 0.2) is lightweight and breathable, ideal for warm weather or heated rooms. A higher TOG (like 2.5 or 3.5) provides more insulation for cooler environments.

Most sleep bag brands, including Love to Dream®, offer a range of TOG options so you can dress your baby appropriately for the season and your home's temperature. The key is to match the TOG to the actual room temperature, not just the season, because indoor heating and cooling can vary.

• Check the room temperature with a reliable thermometer, not by feel.
• Remember that TOG ratings assume a certain base layer of clothing; always check the brand's guidance.

TOG Temperature Guide

As a general rule, here's how to match TOG to room temperature: 0.2 TOG for 75°F and above, 1.0 TOG for 68–75°F, 2.5 TOG for 61–68°F, and 3.5 TOG for 57–61°F. These ranges are starting points. You may need to adjust based on your baby's age, health, and personal warmth.

For example, Love to Dream®'s Swaddle Up™ 1.0 TOG Cotton swaddles are designed for room temperatures around 68–75°F, which covers most indoor environments. If your nursery runs cooler, you might opt for a 2.5 TOG sleep bag or add a layer of clothing underneath.

• Always place your baby on their back to sleep, and avoid loose bedding.
• Check your baby's neck or back to see if they are too warm or too cool—not their hands or feet.

How to Choose the Right TOG for Your Baby

Start by measuring the temperature of the room where your baby sleeps. Then, consider what your baby typically wears to sleep. A good rule of thumb is to dress your baby in one more layer than you would wear yourself. If you're unsure, start with a mid-weight TOG like 1.0 and adjust.

Also, think about your baby's sleep habits. Active sleepers who move around a lot may stay warmer, so you might choose a lower TOG. Newborns and younger babies who can't move as much may need a higher TOG in cooler months. Always prioritize safety: avoid overheating and never use loose blankets in the crib.

• When in doubt, choose a lower TOG and add a layer of clothing, as it's easier to remove a layer than to cool a too-warm baby.
• Consider buying a sleep bag with a TOG that matches your typical room temperature, and have a lighter or heavier option for seasonal changes.

Decision Rules for Picking a TOG

• Room temperature above 75°F: Choose a 0.2 TOG sleep bag or just a diaper and a light cotton onesie. Overheating is a risk, so keep it minimal. Look for lightweight, breathable fabrics.
• Room temperature 68–75°F: A 1.0 TOG sleep bag is your go-to. Pair with a long-sleeve onesie or pajama set. This is the most common indoor range. This TOG works for most seasons; adjust base layers as needed.
• Room temperature 61–68°F: Choose a 2.5 TOG sleep bag. Dress your baby in a long-sleeve onesie and footed pajamas underneath. This is typical for cooler months or air-conditioned rooms. Check your baby's neck to ensure they're not sweating.
• Room temperature below 61°F: Use a 3.5 TOG sleep bag or layer a 2.5 TOG bag over warmer pajamas. Ensure the room isn't too cold for your baby's comfort. If your baby feels cold, add a layer rather than increasing TOG beyond 3.5.

Love to Dream® Sleep Bag Options

• Swaddle Up™ 1.0 TOG Cotton Powder Pink Twinkle: The Swaddle Up™ is an easy-to-use zip-up swaddle, designed to support a natural arms-up sleep position for gentle self-soothing and longer sleep. This 1.0 TOG swaddle is ideal for rooms between 68–75°F, which covers many nurseries. The arms-up design supports self-soothing, helping your baby sleep longer.
• Swaddle Up™ 2-in-1 Transition Bag 2.5 TOG Cotton Rose Pebbles: The Swaddle Up™ 2-in-1 Transition Bag is the easiest way to graduate your baby from swaddling to arms-free sleep with a familiar, snug swaddle fit and the safety of zip off wings to preserve the consistency of your sleep routine through the rolling milestone. If your baby is transitioning out of the swaddle and your room is cooler (61–68°F), this 2.5 TOG bag provides warmth while allowing one arm out at a time, making the transition smoother.
• Sleep Suit Long Sleeve 1.5 TOG Cotton Fleece Blush Twigs: The Love to Dream™ Sleep Suit is a wearable all-in-one blanket with legs, thoughtfully designed for growing kids ready for more freedom - without compromising on comfort or safety. For toddlers who have outgrown swaddles, this 1.5 TOG sleep suit offers a middle ground between 1.0 and 2.5 TOG, suitable for cooler rooms while allowing full leg movement.

Fit and Suitability Guidance

Best for

• Parents who want a simple, safe sleep solution without loose blankets and need clear guidance on warmth.
• Babies who sleep in rooms with varying temperatures and need a sleep bag that matches the season.

Not for

• Parents who prefer traditional swaddling with arms down; consider a swaddle that allows arms-up positioning instead.
• Toddlers who need full leg freedom; a sleep suit with legs may be more suitable than a sleep bag.

Choosing the right TOG rating doesn't have to be complicated. Start with the room temperature, use the decision rules above, and always check your baby's comfort. With the right sleep bag, you can help your little one sleep soundly and safely through the night.