The Secret is in the Mother’s Voice – The Koola Doll™ and Sing to Sleep Technology

Unlike most other basic baby sleep aids on the market, there are multiple ways the Koola Doll™ can be used.

“The most effective approach is for parents to start planning for the use of the Koola Doll™ before the baby is born.”

The mother’s and father’s voices are heard from around the 20-week mark. There are several ways to use the Koola Doll™, however to get the most magic out of this sleep aid, there’s something you can do when the mother is pregnant. Either mum or her partner should sing a song to the baby (the baby bump) on a daily basis. Then when the baby is born, the Koola Doll™ can be turned on, playing your voice singing the familiar song – reminding the baby of that same sound they heard when they felt safe and comfortable in the womb.

The mother’s voice singing to a baby before and after birth is powerful – read the science here.

There are no right or wrong ways to use the Koola Doll™ as every single baby has developed in the womb with their mother’s voice. A child will always remember their mother’s voice. If the father was close by when the child was in the womb, his voice will also be remembered. The magic is there whether you have prepared a song pre-birth or not. By starting early, the baby will be more likely to develop a strong attachment to the doll and find comfort in it when needed.

“My husband snored throughout my pregnancy and I found that my daughter today still relaxes and is soothed by the recording of his snoring!”

Since I was going to the trouble of making this doll to help other families, I figured I may as well pack in more unique features that support children with relaxation and sleep. Every child is different – why not pack the Koola Doll™ with extra magic while I am there, as what works for one child may be different for another child – so the more options the better.

“We created four very special sleep soundtracks.”

With the help of a team of sound experts, we have created four pre-programmed soundtracks that parents can choose from, in addition to the option of recording their voice. These soundtracks are not your average lullabies. They contain special lower frequency music tracks that are designed to promote relaxation and sleep by synchronising with the brain and promoting pre-sleep alpha brainwaves and deep sleep delta wave activity. We have also incorporated Solfeggio frequencies into two of the tracks as well as the Schumann’s Resonance in the remaining 2 tracks. These frequencies have been used for centuries across various cultures as a healing tool. Sound has long been recognised as a powerful medium for balancing the mind and body, from Shamanic chants of Indigenous tribes to the mantras of Hinduism and Buddhism.

Learn more about the scientific studies using healing frequency music here.

“Parents can either play their voice to their baby or select one of the four soundtracks.”

After conducting extensive research into the scientific literature on sleep and music, a conscious decision not to include white noise in the Koola’s sound machine was made. Two main reasons for this are that there is a lack of high-quality studies available on white noise that show it to be effective for sleep. Actually, the findings are quite the contrary. It is surprising how popular white noise is compared with other options. 

The second reason for concern was the research indicating possible effects of white noise on language development delays in infants. Prolonged exposure to white noise has been shown to cause language delays in infants. This is because white noise lacks patterns and space between sounds, making it difficult for infants to form the neural pathways required for language development.

To learn more about why white noise is potentially bad for infants read this.  

The four soundtrack parameters were created utilising 528 Hz frequencies and below. Lower frequency music in the range our tracks have been created have a ton of research consistently showing phenomenal sleep and health outcomes. We also chose not to utilise pink noise or brown noise. Learn why the Koola soundtracks do not use white, pink or brown noise here. 

The Koola sleep songs incorporate stimulating patterns throughout the music tracks, while also being mindful of space between sounds. Reflecting on the science, this aims to provide a more natural and stimulating environment for infants that supports their language development while at the same time supporting sleep.

“A study showed when young rats were exposed to unchanging, random sounds like white noise, the development of their brain’s hearing centre was postponed. White noise, which lacks any discernible auditory patterns like radio static or the hum of an air conditioner, differs from speech or music.”

If parents want to use something other than their voice for soothing the baby to sleep, they can select from one of the four Koola sleep melodies. The sound team ensured the Koola Doll™ soundtracks still have a similar feel to white and pink noise – lessening the exterior noise and preventing the child being startled., while still providing opportunity through patterns and space for the development of the brain’s hearing centre. 

“This doll has been in the testing and development phase for 4 years.” 

And it will continue to improve and evolve. 

We have left no stone unturned in our pursuit of a product that the user experience is beneficial for both parent and child.

With a built-in rechargeable battery, you no longer need to worry about running out of batteries. From our timer options where you can play any of the sounds for as little or as long as you like, to the colour of the lights supporting melatonin production and the circadian rhythm, to the ability to control the volume or access the sound box from outside of the toy…to the multipurpose chew ring necklace for attaching to the crib or stroller. 

And to top it off, we went to the extent of sending the doll to the laboratory for extensive child safety certification giving it the tick of approval as a safe product for babies for many countries across the globe. It is surprising to learn that many of the most popular baby products on the market have never been tested and certified and people still give them to their children.

There are so many wonderful things about the Koola Doll™ that makes it such a special baby sleep product. Our daughter is 6 years old and still carries her Koola around with her (she called it stuffy).

The Koola Doll™ is unlike other products purchased for children today that will be ignored and tossed out after a few short months.

“This doll is special! It is a keepsake that children cherish for years and they can hand down to their own children.”

Children of any age who have anxiety are also responsive to the Koola Doll™ as hearing their parent’s voice or a personalised sound is a calming tool. As a Special Educator myself, I know how challenging life is for many children with anxiety and autism and I hope many children benefit from the Koola, not only for aiding babies’ sleep.

There are so many helpful possibilities – another example is how the doll can assist parents who have a surrogate mother carrying their baby. Playing the mothers voice singing a song daily to the baby while it develops in the womb can help the parents form attachment after birth. 

Life is a journey and I can honestly say the Koola Doll™ wouldn’t be here today without the birth and those challenges we went through in our journey with our daughter Indie.

I hope the Koola brings your family as much joy as it has for us.

With Love, Health and Happiness,

The Koola Mum XO

Checkout the best baby newborn gift The Koola Doll here.


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