What is a Baby Sleep Bag?

A Baby Sleep Bag (or Baby Sleeping Bag) is a “wearable blanket” designed for babies to be used instead of traditional blankets and sheets. Baby Sleep Bags have a neck opening and armholes and are therefore “worn” by the baby to help the baby stay at the right temperature through the night without the problem of traditional blankets and sheets being kicked off or getting tangled up.

Are Baby Sleep Bags safe?

Yes. Well fitting, low-tog Baby Sleep Bags, when used correctly, are potentially one of the safest forms of bedding for your baby. While the baby has complete freedom of movement within the Baby Sleep Bag, the fitted neck and armholes ensure that there is no danger of either slipping in or out, provided the baby is placed in the correct size of Baby Sleep Bag for his age/weight. Therefore, provided also that a suitable level of nightwear is worn, he can sleep safely at a pleasant and constant temperature throughout the night.

Why should I use a Baby Sleep Bag instead of blankets and sheets?

They stop babies kicking off their covers, getting cold and waking themselves and everyone else up

They can’t be kicked over your baby’s head or get tangled up

They keep babies at a comfortable temperature all night long

Your baby can wake up, move around his cot, and fall back to sleep all on his own without you having to tuck them back in

They become a great part of the bedtime routine, and will help your baby feel familiar, secure and confident and understand when it’s time for bed, even when away from home

They can help the transition from Moses basket to cot by being the familiar “comforter” in both

They may delay the age at which your baby rolls over onto his tummy

They may delay the age at which your baby is able to climb out of his cot.

Can I use a Grobag Baby Sleep Bag in a Moses basket?

Yes you can, however there will be extra fabric which you can either tuck under the mattress or fold at the end of the basket. If your baby is under 12lb, you could use a Gro-snug 2in1 swaddle and new-born Grobag which will fit into the Moses basket perfectly and can be used with arms in (like a swaddle) or out (like a Grobag Baby Sleep Bag).

What should my baby wear under a Grobag Baby Sleep Bag?

What your baby wears will depend on the tog of Grobag Baby Sleep Bag and the temperature of your baby’s bedroom. (In the same way as you would adjust nightclothes and number of blankets). As a guide, please refer to the table below. Please remember, though, that babies are all different and, just as with blankets and sheets, you will soon discover what your baby is most comfortable wearing. Placing your fingers on your baby’s chest is the best indicator of whether they are too hot/too cold/just right as babies’ hands often feel cool.


Which weight (tog) of Grobag Baby Sleep Bag should I buy?

Our 2.5 tog Grobag Baby Sleep Bags are ideal for Autumn, Winter and Spring and can be used right up until the Summer nights become warm. If your nursery is usually below 20°C, we recommend a 2.5 tog Grobag. However, if you live in a particularly mild region or if you have well insulated and heated accommodation and your nursery is usually 21°C or above, you may prefer a 1.0 tog Grobag for year round use. Our 1.0 tog Grobags are ideal for use from during the Summer months when the nights are warmer and are also very useful in early Spring and Autumn for day-time naps whilst your baby is still in a 2.5 tog Grobag at night. 0.5 tog Grobag Baby Sleep Bags are for use in high Summer, for holidays abroad, or if your child is unwell and has a raised temperature.

What does the TOG rating mean?

The Tog rating describes the warmth or “Thermal Resistance” of a product and is widely used in the UK to explain warmth levels of duvets. Grobag Baby Sleep Bags are tog tested to conform to BS4745:1990 and to the new British Standard BS 8510:2009. Latest advice from Health professionals is that Baby Sleep Bags should be ‘lightweight’ and to meet the new British Standard, Baby Sleep Bags must be between 2.0 and 3.5 togs for temperatures between 10°C and 20°C. This is why our main range of Grobags are 2.5 togs for the recommended ideal nursery temperature range of 16°C and 20°C.

What is the best room temperature for my baby?

The Lullaby Trust and Health Professionals recommend that the ideal room temperature for your baby is between 16°C and 20°C, and ideally at 18°C/65°F. Our 2.5 tog Grobag Baby Sleep Bags are designed to be used in this temperature range. If the nursery is warmer or colder, simply adjust the level of clothing your baby is wearing. During summer months, or in warmer climates, if your baby’s nursery is above 20°C and we recommend using our 100% cotton 1.0 tog or 0.5 tog Grobags.

What should I do if my baby gets too cold or too hot?

If your baby has woken up because he is too cold, pick him up & adjust either the temperature of the room, or the baby’s clothing. You can cuddle your baby in his Grobag to warm him up again before putting him back, warm and cosy in his cot. If your baby feels hot, you should cool him down by removing some clothing, then either adjust the temperature of the bedroom or the clothes your baby is wearing before returning him to his cot.

Is there any danger that my baby could become too hot in a Grobag Baby Sleep Bag?

Provided you follow the guidelines on your nursery thermometer (provided FREE with 0-6 and 6-18 month Grobag Baby Sleep Bags), there should be no danger of your baby over-heating. Always keep your baby’s head uncovered. It is safest to use a Baby Sleep Bag without sleeves and never use any clothing or bedding with a hood attached. Decrease the level of nightclothes and bedding if your baby is unwell and has a raised temperature. If you are in any doubt, please consult a Health Professional.

What size Grobag Baby Sleep Bag should I buy?

Our 0-6 month size Grobag Baby Sleep Bag is suitable from birth if your baby weighs 8.8lbs (4kg) or more or from when your baby reaches this weight. It will last until your baby is 6 months old and may well last longer.

The 6-18 month size is suitable from when your baby is 18lb (8.1 kg) and is generously sized so may easily last until your baby is between 18 and 24 months.

Our 18-36 month size is suitable from when your toddler weighs 25lb (11.4kg) and many toddlers are still wearing their Grobags well after the age of 3.

How many Grobag Baby Sleep Bags should I buy?

As the larger sizes last for at least a year, we recommend you buy at least 2 Grobags (so you will always have a spare one if you suddenly need one in the middle of the night!).

Why don't Grobag Baby Sleep Bags have sleeves?

We at Grobag believe that Baby Sleep Bags should be sleeveless to aid heat loss and air circulation. (Babies sleeping under traditional blankets rarely sleep with their arms inside). The new British Standard also stipulates that Baby Sleep Bags should be “without sleeves or hoods”. In cooler weather, we recommend long-sleeve bodysuits, in addition to a long-sleeved pyjama top, pyjamas or a sleepsuit.

How do I wash my Grobag Baby Sleep Bag?

All Grobag Baby Sleep Bags can be machine washed at 40°C. They can be hung out to dry or tumble dried on a low setting. As with all cotton goods, we have designed our Grobags to allow for up to 5% shrinkage. If your child has any allergies and you wish to wash your Grobag at 60°C, you should allow for a little more shrinkage. In general, think environment – if not dirty wash at 30°C!

When washing, it is best to keep the zip closed. You can iron your Grobags on a low heat if desired, always keeping the iron away from the zip or covering the zip with a cloth.

We recommend that you wash dark colours separately for the first few washes. We also recommend that you wash your Grobag with a detergent that is free from bleaching agents in order to retain the original colours.

When do I stop using a Grobag Baby Sleep Bag?

Baby Sleep Bags can be used right up to the time your child is ready to move from a cot to a bed, and because of the freedom of movement they allow, they can be used even longer if your child wishes. Even though your toddler will happily stand up in a zipped Grobag, cot-climbing will be far from easy, and your Grobag may well delay the age at which you have to move your child to a bed – a big bonus!

What other bedding can I use with my Grobag Baby Sleep Bag?

You should use your Grobag instead of blankets and sheets. The only other bedding required is a bottom sheet. Grobags are designed to replace blankets and sheets. They come in three tog (warmth) ratings for your individual baby and the temperature of your baby’s sleeping place. Duvets, quilts and pillows should not be used for babies under 1 year old and never with a Baby Sleep Bag. The Lullaby Trust recommend that the safest place for your baby to sleep is in a cot or crib in your room for the first six months. However, if your baby shares your bed, make sure he is only in a Grobag, and not under your own bedding as well. Please note that Grobags are designed to replace blankets and sheets in your baby’s cot or bed. They are not intended for use as dressing gowns outside the baby’s bedroom.


Important: never use your Grobag Baby Sleep Bag with a duvet or quilt.

Why don’t you sell Grobags to last my baby for longer – e.g. from 6 month to 3 years?

Babies do a great deal of growing between 6 months and 3 years and we don’t believe that it would be responsible to try to manufacture a Baby Sleep Bag that would fit, and be safe for, both a 6 month old baby and a 3 year old toddler. Babies grow at the greatest rate in their first 6 months of life, and then their rate of growth slows down gradually. This is why our youngest size Grobag (0-6m) lasts for 6 months, our next size up (6-18m) lasts for a whole year, and our third size up (18-36m) lasts for a full 1½ years.

Why is the weight of the baby so important for the smaller size Grobag Baby Sleep Bag?

Our key safety consideration is to ensure that babies cannot slip down inside the Baby Sleep Bag. Therefore, we design the neck size to be as large as possible to allow comfort and heat loss, whilst being smaller than the average head circumference of the younger age/lower weight of baby we advise for the Grobag Baby Sleep Bag. We use health professional graphs to link head sizes with weight and this is also in line with the new British Standard for Baby Sleep Bags (BS 8510:2009). Most new parents do not know the head circumference of their babies, but they can keep a track of their weight, hence we use weight as a guide.


You must always take care not to allow your baby’s head to slip down and get covered by any bedding, whether that bedding is a Grobag Baby Sleep Bag, blankets or sheets.

When can I first put my baby in a Grobag Baby Sleep Bag?

Our 0-6 months Grobag Baby Sleep Bag can be used for a full-term, 8.8 lbs (4kg) baby from birth. However, if your baby weighs less than 8.8 lbs (4kg) at birth, we recommend you wait a short time, until your baby grows larger. For the first few weeks and for babies under 8.8 lbs (4kg), we recommend the Gro-swaddle or the Gro-snug (our 2-in-1 swaddle and newborn Grobag) as a safe and easy alternative for your baby. Our 0-6 month size Grobag includes under-arm poppers to reduce the size of the armholes for babies up to 10lbs (4.5kg).

What is the difference between a Grobag and any other Baby Sleep Bag?

Over 90% of new parents in the UK now use a Baby Sleep Bag but when Grobags were launched, this figure was less than 2%. At The Gro Company, we are really proud that we have changed the way that the nation puts its babies to bed. But it really does go further than that! When the company started, we not only wanted to give both parents and babies a better and more peaceful night’s sleep, but also a safer night’s sleep. We have worked with, and supported, The Lullaby Trust since 2001 to help promote safe sleep for babies and to help fund their research. We also follow all the latest research into safe sleep to make sure that not only are our Grobags the best quality and safest possible, but also that the information we provide is the most up-to-date and useful for parents and carers. So when you buy a Grobag you can be sure that:


You are choosing a Baby Sleep Bag that meets all the requirements of the new British Standard (BS 8510:2009)

You are choosing the only Baby Sleep Bag recommended by The Lullaby Trust, the UK’s leading Cot Death Charity

You are choosing a Baby Sleep Bag that has gone through rigorous quality control and testing

You are choosing a Baby Sleep Bag that uses only the highest quality and reliable components such as YKK zips and poppers

You are choosing a Baby Sleep Bag which will be correctly sized for your baby, in line with the new British Standard

You are choosing from the widest range of sizes and togs available

You have a FREE nursery thermometer and instructions to ensure that you know how to use your Grobag safely and correctly

You are choosing a Baby Sleep Bag with 100% natural cotton lining and outer fabric

You are choosing the UK’s favourite pioneering, and award winning Baby Sleep Bag, Grobag!

Remember: a Baby Sleep Bag by any other name, is simply not a Grobag!

Why has Grobag created a 3.5 Tog?

The launch of the Winter Warmer Grobag is based on recent feedback we have had from parents. They have noticed temperatures dropping over the past few winter seasons, with more bursts of extreme weather, and they told us they felt they needed something warmer for those occasions.

When should I use a 3.5 Tog?

In room temperatures of 16°C and below

Does this now mean my 2.5 Tog isn’t thick enough for winter?

The 2.5 Tog which we describe as an All Year Round product is suitable for most room temperatures in the UK (16-20 degrees). However over the past couple of years our customers have been asking us for something thicker for winter when they have noticed really cold temperatures. Hence, we have created the 3.5 Tog. If you only have a 2.5 Tog, we recommend trying to keep the room temperature your baby is sleeping in within the 16-20 degree range, and layering the clothing under their Grobag accordingly.

Can’t I just use another blanket on top of my Grobag when it is really cold?

Loose blankets can be kicked off, plus you may not know the tog level you are putting on your child, so we recommend using a 3.5 Tog Grobag which you know has been tog tested and meets the British Safety Standard.

Is the 3.5 Tog still recommended by The Lullaby Trust and does it meet the British Standard?


When can I first start using a Gro-swaddle?

The Gro-swaddle is suitable for use from new-born up until around 3 months.

What should my baby wear under a Gro-swaddle?

It is very important that you check on your newborn baby regularly to ensure that s/he is not too hot or too cold. To do this, simply place your fingers gently onto her back or chest. It is normal for a young baby’s fingers and toes to feel cold, so this is why it’s important to check the back or chest.

What your baby wears will depend, not only on the temperature of the bedroom, but also on your individual baby, and, with regular checking, you will soon get used to knowing what level of clothing works best. As a general rule, in the recommended nursery temperature of 16-20Oc,  we recommend either a cotton bodysuit (short sleeves and no legs), or a cotton sleepsuit (with legs and arms). If the bedroom is on the cool side, or your baby feels cool to the touch on her back/chest, then it is fine to layer the clothing, using both a bodysuit and sleepsuit.

In a very warm bedroom, you could simply use the Gro-swaddle with no clothing underneath. If the bedroom is hot (over 24OC), try to cool it down, and if this is not possible, consider not using the Swaddle until it is cooler.

As your baby gets older and you want to move to underarm swaddling, so that your baby’s arms are not covered by the Swaddle, you may want to adjust the level of clothing to account for this. For under-arm swaddling, in the recommended nursery temperatures of 16-20OC, a cotton long-sleeved sleepsuit or both a bodysuit and long-sleeved sleepsuit are recommended.

What tog is a Gro-swaddle?

Because the Gro-swaddle is a single layer and “worn” close to the body, we do not provide a tog rating. New-born and very young babies are all individual, and the most important thing is to check on your baby regularly to ensure that s/he is at a comfortable temperature. Please see What should my baby wear under a Gro-swaddle  for more information.