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Launch of a unique fully enclosed muslin baby sleeping bag represents a new generation in bedding for babies

A pair of young mums are behind the launch of a unique baby sleep solution that offers a much-needed safe alternative to swaddling. The launch represents a new generation in swaddling and sleepwear for babies.

Girl + Boy’s new inbetweenie™ baby sleep sack is based on the two mothers’ own experiences with their respective children: one who did not like being swaddled as a baby and another who was diagnosed with infant hip dysplasia.

Infant hip dysplasia (also known as developmental dysplasia of the hip or DDH) is a common childhood condition that, if not detected and treated early, can leave the person needing a series of operations and the potential for a hip replacement to be needed later in life as well. It is now known that swaddling tightly and narrow swaddle sleeping suits can actually cause the condition.

Girl + Boy founder, Jane Sundstrum says, “When our children were very little we found ourselves frustrated in limitations with the swaddling and sleeping bag options available. When we started researching beyond our own personal events and children’s preferences, we began to see the beginning of a shift in behaviour about swaddling babies yet no-one seemed to be offering any alternatives.”

It is widely known that once a baby has begun to roll swaddling should be ceased altogether. Swaddled babies are at risk of suffocation when they roll over as they are unable to push themselves up again.

Jane says, “However for many parents who have established a successful sleep routine, with swaddling, it can feel almost impossible to stop this, and many parents will continue to swaddle up to 6 months. Given that many babies begin to roll at around 3 months, we thought it was surprising that new swaddle wraps and sleeping bags come onto the market, every year, with little variation on design.”

New guidelines published in February 2017 by the American Academy of Paediatrics, advise that parents should stop swaddling their babies at 2 months of age, in an effort to reduce the risk of SIDS related deaths. Swaddled babies are at risk of suffocation when they begin rolling over on their own, as they are unable to push themselves up. This is a dramatic change from the original advice of 6 months and will come as a shock to most parents.

Additionally, medical experts believe that narrow swaddle suits and tight swaddling over the hips may be responsible for a rise in cases of late diagnosed infant hip dysplasia, which was noted across children’s hospitals in NSW and South Australia.

Sarah Twomey, Founder and Chairperson of Healthy Hips Australia, a national health promotion charity working to improve awareness, support and early diagnosis for hip dysplasia in Australia, and International Advisor to the International Hip Dysplasia Institute, explains that there are many benefits to swaddling during the first months of life, but wrapping babies too tightly could be doing more harm than good.

“It provides security and comfort and aides in settling and establishing sleep patterns. However, research indicates swaddling can increase the risk for hip dysplasia. Hip dysplasia is a common childhood condition where the hip joint does not fit in the ‘normal’ position due to abnormal development and/or lack of growth of the joint’s ball and socket.”

Twomey was impressed with the Girl + Boy inbetweenie™ design as it is in-keeping with her healthy hips tips. “When swaddling your baby, you should allow room around the hips for movement. The legs should be free to move into the natural frog position,” says Twomey.

Jane says, “As mothers, we really understand the daily challenges of getting your baby to sleep. We wanted to offer a safe sleep solution that didn’t compromise the comforts of being swaddled.”

The new inbetweenie™ sleep sack is a highly unique, all-enclosed sleep sack made from lightweight muslin, suitable for all babies up to 1 year old. It has all the benefits of a swaddle without the risks.

Based on the simple concept of a safe, soft boundary, the inbetweenie™ helps to control the startle or moro reflex and allows babies to find their fist and self soothe. It offers enough room to naturally stretch out their hips and safely expand their chest; and sufficient movement to safely roll on to their front and back again.

The unique design of a full enclosure and soft neckline also keeps little hands and necks covered as well as protected from mosquitoes or bugs, so your baby will stay cosy through the night.

“The inbetweenie™ is a beautiful uncomplicated solution that will help your baby sleep safely and comfortably,” adds Jane.

About the inbetweenie™

The inbetweenie™ range comes in two weights: the Extra Light made from a feather fine cotton and is TOG rated at 0.2 and ideal for hot summer nights over 25°C, and the Original Muslin double weight muslin fabric. which can be used for most of the year simply by adding or removing layers of your baby’s clothing. The Original is ideal for sleeping environments between 18-25°C degrees, including rooms which are cooled by air conditioning or fans right through to warmer winter nurseries.

Available in two sizes 3-6 months and 6-12 months. The Original Muslin retails for $79.95 and the Extra Light for $74.95.

Visit us at and Healthy Hips Australia at

Healthy Hip Tips for Parents:

Allow for the natural frog leg bend of the legs
Avoid tight swaddling or narrow swaddle suits in the lower half of the body (opt instead for a safe “arms out” sleeping bag or inbetweenie™ sleep sack)
Avoid narrow based car seats or prams
Avoid any baby carriers where the legs hang down (safe carriers include the Ergo Baby or the Manduca)
Use transition swaddles well before your child begins to roll (such as the Love to Dream Transition or inbetweenie™ sleep sack)

*2016 research published in the Medical Journal of Australia stated that swaddling could be causing joint development issues, including ‘clicky hip’. The report states that there has been an increase in the late diagnosis of developmental hip dysplasia occuring nationally. The study says, “There is growing concern among the orthopedic fraternity in North America, the UK and Australia that a resurgence in the popularity of swaddling, including the increased use of ‘swaddling cocoons’ places children at risk of late diagnosed infant hip dysplasia.

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