Agatha Boutique is an online store specializing in clothing, accessories, and essentials for babies and children in Quebec and across Canada. We offer a complete selection including clothing for girls and boys, baby items, and practical everyday accessories. In addition to children's clothing, discover our selection of toys, games, strollers, car seats, and children's furniture such as beds and mattresses. All our products are chosen for their quality, safety, and durability. Whether you're preparing for the arrival of a baby or looking for daycare essentials, Agatha Boutique is a one-stop shop for families in Quebec and across Canada. Take advantage of our fast shipping and discover our new arrivals online regularly.
What TOG Sleep Sack Does My Baby Need?
Short answer: choose a sleep sack for the temperature of the room where your baby will actually sleep, then follow the manufacturer's guidance for that exact sack. If the room is warm, choose a lightweight sack. TOG helps compare insulation; it is not a universal thermostat setting. The right size and avoiding overheating matter just as much as the number.
Why start with the room, not the season?
A January night can mean a well-heated condo; a June night, an air-conditioned room. Check the room temperature at bedtime and allow for heating or cooling overnight. Health Canada's advice is plain: keep your baby warm, not hot. Sleepwear should suit the temperature of the room, and if the room is comfortable for you, it will be comfortable for your baby too. Overheating is a risk factor for sudden infant death syndrome (SIDS).
What can TOG tell you, and what can't it?
TOG is an insulation rating: in general, a higher number means more insulation. On its own, it can't account for what your baby wears underneath, a change in room temperature, the fit or the product's instructions. That's why a universal "this TOG equals this temperature" table can mislead.
Choose in that order: room temperature, product guide, then simple, fitted sleepwear underneath. Don't add a loose blanket because a sack feels light: Health Canada says you don't need a blanket if you use a sleep sack. Babies also don't need a hat indoors or outerwear for sleep.
Do two sacks with the same TOG suit the same room?
Not necessarily, as the listings of sleep sacks we carry show (checked on 1 October 2026). Mini Biscuit describes its 1 TOG Daydreamer Lazybones sack as designed for rooms between 18 and 22 °C. Merla Baby lists its 1.0 TOG long-sleeve bamboo sleep bag for rooms between 22 and 26 °C, its 1.5 TOG model for 20 to 24 °C and its 2.5 TOG model for 16 to 20 °C. Silkberry Baby gives the TOG of its sacks (0.5, 1 and 2.5) and asks you to dress for the room, without a temperature range.
Temperature Regulating Bamboo Long-Sleeve Sleep Bag 1.0 TOG
Sizing differs too. Silkberry Baby and Ry & Pen size their sacks by age (up to 6 months, 6 to 18 months, 18 to 36 months), Ry & Pen adds a length and a weight range for each size, and Merla Baby sizes by height in centimetres and recommends its sleep bags from 6 months. Read the guide of the sack you're buying; if it gives no temperature range or size details, ask before you order.
Why is fit a safety check?
A sack can have the right TOG and still be wrong if its size is off. Health Canada explains that if it's too big, your baby can slip down inside it, which can make them overheat or suffocate; if it's too small, your baby may not be able to move their hips and legs freely, which can be dangerous, especially if they roll onto their tummy. Follow the product's size guide: Silkberry Baby, for example, asks for a size that fits at the neck and armholes, with room for the hips and legs.
Bamboo Sleeping Sack 2.5 TOG (Pine)
Fasten the sack as designed and, as Health Canada recommends for all sleepwear, check regularly for loose snaps, zipper pulls, buttons or threads. Keep the nose and mouth clear.
What about weighted and swaddle sleep sacks?
Don't use a weighted sleep sack, swaddle or blanket: Health Canada says they are not safe for your baby. Health Canada also says there's no research to support the use of swaddle sleep sacks. If you choose one, swaddle loosely so your baby can breathe and move their hips and legs, always place your baby on their back to sleep, and stop swaddling around 2 months, before your baby can roll over. The Canadian Paediatric Society adds: stop when your baby shows signs of rolling over. Swaddling isn't safe for babies when they're on their tummy.
Frequently asked questions
Is there one TOG chart for every brand?
No. Health Canada's sleep guidance gives no TOG-to-temperature table, and two 1 TOG sacks we carry state different room ranges. Follow the guidance for the exact product.
Should I add a blanket over the sleep sack?
No. Health Canada says you don't need a blanket if you use a sleep sack. Keep the sleep space clear.
Can I buy a bigger sack so my baby grows into it?
Not if your baby can slip down inside it. Choose the size that fits now, using the manufacturer's size guide, with room for the hips and legs.
When should I stop using a swaddle sleep sack?
Stop swaddling around 2 months, before your baby can roll over, and as soon as they show signs of rolling. Swaddling isn't safe when a baby is on their tummy.
For the whole sleep space, see what you actually need for safe baby sleep.
This article provides general information, not medical advice. Follow the instructions for your exact product and the guidance of your health professional.