baby monitor pointing at crib

When did baby monitors come out?

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Today the baby monitor has become a device in which parents are practically expected to own. You can find baby monitors on the list of just about every new parent's must-haves.

There is good cause for all of this: having an ear (or even an eye) on what your child is doing when they are alone can be an invaluable tool in preventing mishaps and even ensuring you never miss beautiful, private moments to be cherished for a lifetime.

Yet this wasn't always the case. Less than a hundred years ago, the concept of a baby monitor was utterly unheard of, and less than fifty years ago it was still a rarity. So what happened? Let's take a look at a brief history of the baby monitor to get an idea of what changed.

Have you ever wondered how the baby monitor came to be? Who designed this remarkable life-saving device that can pass off as an assistant robotic parent? Because how else are modern-day parents expected to keep an eye on their little ones 24/7 given our demanding schedules!

There's no need to speculate. If you want to learn all about the interesting history of baby monitors, as well as what the future holds for this innovative device, you've come to the right place.

Let's Start At The Beginning: When, Where, How, And Why Were Baby Monitors Invented?

One thing is for certain: baby monitors were non-existent a century ago. Grandmothers can confirm this fact and gladly remind us how they raised us the old-fashioned way (without the help of technology or robotics). So, what changed? Who decided to invent a baby monitor, and why? Was it the brainchild of an anxious parent who was overwhelmed by constantly checking in on baby every five minutes? I'll have you know that the motivation behind the unit's invention was under the most somber circumstances.

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When Were Baby Monitors Invented?

Baby monitors were first invented and released to the market in 1937. This was a revolutionary product that made parenting – for those who could afford it at least – a much less stressful endeavour. Unfortunately, the events that led to the need and subsequent invention of the first baby monitor were heartbreaking.

baby monitor app

Why The First Baby Monitor Was Invented

It took a tragic kidnapping in 1932 for the first baby monitor to be invented. On this fateful Tuesday night, Charles Lindbergh's son – aged 20 months at the time – was abducted from his home. A ransom note was found in his room confirming these suspicions. Charles was a prominent aviator in the United States of America. One would wonder how this could have possibly happened, given the fact that both the mother and nanny were at home on that particular day. Would this have happened if there was a baby monitor in the house? I'm inclined to think otherwise. Heartbreakingly, a month later the remains of Charles Jr were found just a few kilometres away from the Lindbergh residence. Seeing as the incident was a high profile case, it became national news and talk of the town. The story inspired Eugene McDonald, who was then President of a company called Zenith to design the first-ever baby monitor. The premise upon which this baby monitor was built upon was simple: to prevent a similar tragedy from happening to his child. Mr McDonald placed the unit in his daughter's room in an attempt to monitor noises coming from the room. It was only after he felt satisfied with the unit's performance did he give his company the go-ahead to commercialize the product.

The invention of the First Baby Monitor – Zenith Radio Nurse in 1937

The Zenith Radio Corporation engaged Isamu Noguchi to design the first baby monitor in 1937. The audio baby monitor which was complete and ready for sale by 1938 was named Zenith Radio Nurse. It had a sound amplifying system with two units, the Guardian Ear and a Radio Receiver. The guardian ear's analog intercom system transmitted sound on a 300 kHz signal transmitter over the power line. The communication was one-way.

The Zenith radio nurse first sold for $29.95 in 1938, an equivalent of $523 in 2019. This was quite expensive, and in addition, it's electrical transmission was plagued with technical problems, mainly distortions and RF interference. It shared a radio frequency with other consumer products, mainly the car radios and garage door openers. Below is how the Zenith radio nurse worked:

  • The Guardian Ear controlled a microphone, a sound amplifier, and an oscillator circuit(modulator ).
  • The generated circuit was conducted by means of the lighting circuit and was intercepted by the radio nurse.
  • The receiver unit of the Zenith Radio nurse had a detector, sound amplified and sound reproducer. The total amplification from the microphone to the speaker was in the order of 500,000 times. This was capable of making the slightest sound audible on the receiver.

The Zenith monitor did not work well with very loud volumes as it resulted in distortions and speaker rattles.

Following the Japanese attack of Pearl Harbor, the anti-Japanese sentiments swept through America, and many receivers were destroyed, making them very scarce. It is now sold as an antique and can be found in a few museums. If you are interested and want to learn more about the Zenith Radio Nurse, you can read the original Zenith Radio Manual.

Check out our range of safety baby monitors here.

Evolution of Baby Monitors:1937 to 1970

The first designed baby monitor, Zenith Radio had one-way intercom and relied on an electrical circuit to transmit its analog audio signals. 


Because of the challenges discussed above, Zenith Radio Nurse model was not produced after 1938, and museums bought the few zenith nurses because of its unique "industrial design".

Between 1937 and 1960s, most baby monitors in the market were sold by a few manufacturers that used Zenith's expired patent and analog signals to transmit audio. During WW II, troops used hand-held analog radio devices to communicate, and the biggest disadvantage was that only one conversation could occur at a time, on each channel. This is called the simplex mode.

The troops managed to overcome this obstacle by tuning receivers and frequencies to different frequencies, but this was difficult as they were using the lower frequency bands, 27 MHz or 49 MHz. The limited number of available frequencies limited them. Below is a video describing analog baby monitors in the 49 MHz bands.  

Although analog radio devices were in use for a long period, they were mainly preferred because they had better ability to communicate especially when a received signal was weak and/or noisy. 

The Invention of Frequency Hopping Spread Spectrum (1941)

The history of baby monitors is very much tied to the invention of a secure communication protocol called Frequency Hopping Spread Spectrum (FHSS). The protocol was invented in 1941 by two Americans, Hedy Lamarr and George Antheil who patented their invention of a secure security protocol that successfully enabled the Allied Forces to communicate and steer torpedoes without being noticed or intercepted.

The technology utilized a spread spectrum sequence which allowed signals to hop from one sub-frequency to another during transit. The spread spectrum technology was named Frequency Hoping Spread Spectrum (FHSS).

The FHSS guarantees 100% privacy of all communications, and the technology is now being used by some of the best-rated baby monitors such as Infant Optics, Babysense video baby monitor, Hellobaby, and Eufy Spaceview. We have a separate post with a list of top hack-proof baby monitors using FHSS technology which you can check out.

It is, however, important to note that while FHSS technology was discovered in the 1940s when the baby monitor industry was at its nascent stages, the technology was not used in baby monitors until the 90s. First, they had to discover digital signals to replace the analog baby monitors and enable encryption for better communication security. 

Check out our post on What are the different types of baby monitors?

Evolution of Baby Monitors:1970s, 1980s and 1990s

Baby Monitors in 1970s

1974: A patent was filed in Spain by Fernandez Aguado Rafael. The patent was for an apparatus for monitoring intercom. It's was described as a device to monitor young children and patients. Apart from monitoring audio, the baby monitor would allow two-way communication. This baby monitoring device would be different from the Zenith Radio Nurse in that it allowed the caregiver or the parent to communicate with the baby. It was however designed to be similar to a telephone as it had a call button and a switch and some argue that this was not entirely a baby monitor.

1979: A patent for a breath monitoring device was filed James K. Frost in Australia and later in the US.

The device was designed to monitor the breathing of an infant and sound an alarm in case of a cessation. An electromagnetic transducer was attached to a 'cot' or baby's crib, and it was supposed to be compressed every time a child breathes.

The transducer was attached to a microphone, and it continuously produced noise if the breathing is normal. It did send an alarm in case the breathing ceased.

The 2000s to 2015 – Rise of Video Baby Monitors

Prior to 2000s, most baby monitors did not use wifi to transmit signals. Analog baby monitors used the analog signal while digital baby monitors started using the 2.4 GHz Wifi, DECT or FHSS technologies to transmit audio and visual signals. It is worth mentioning here that some of the best baby monitors, the best-selling still use FHSS technology. Infant Optics DXR 8 and Eufy Spaceview are the two most secure baby monitors that still use the FHSS transmission technology. 

The Rise Of Video Baby Monitors – When Baby Monitors Became Popular

Prior to 2000s, baby monitors with a camera unit had gained a foothold in the 90s. As discussed in this article above, news outlets, including TV, ran several stories of nannies that were mistreating babies when parents were away. These stories were made possible by nannycams which recorded a video of the baby when the parents were away. Parents had seen the need to purchase baby monitors. As prices continued to fall in the 2000s and with the emergence of wifi baby monitors, baby monitors continued to become very popular.

Because of the stories, scared parents bought the nanny cams, and by the end of 1999, video baby monitors were fairly known by a good portion of American parents. Another big development in the 2000s was the use of wifi to transmit signals. The internet has contributed immensely to the growth of the baby monitors. There are more than 30 patents relating to video baby monitors at present with most of them seeking to utilize the 2.4 GHz band that is used by wifi.

All these were filed within the last two decades, and there are several other pending video baby monitor patents. Some of these baby monitors have had immense success with consumers. Arlo baby became one of the best-selling wifi baby monitors last year (2018) with parents being satisfied mostly with the picture and video quality. Video baby monitors are now being integrated with some of the smart home devices such as Apple Homekit, Amazon Alexa Echo, and Google Home Hub. Google has approved a list of cameras that are compatible with Google Home Hub, and Arlo and Nest are some of the compatible baby monitors

We have compiled a list of some of our favourite baby monitors below:

VTech-RM7754HD-7-Inch-Smart-Wi-Fi-HD-Video-Monitor-for baby nursery


RM7754HD Smart Wi-Fi 1080p HD Video Monitor with Remote Access

The Vtech RM7754HD Video Monitor includes a 7” Colour Parent Unit with a HD video baby camera. Watch your child in real time on the parent unit, or on the MyVTech Baby app either way you can be rest assured that your babies sleep can be monitored from anywhere!

idoo video baby monitor


Baby Monitor with Camera and Audio

Clear real-time view and large display: Large 5-inch 720p video baby monitor display (for parent) provides a detailed view of your newborn in 10x sharper clarity. It also supports remote camera panning (355°), tilting (90°) and zooming (2x magnification) to ensure that you can remotely keep track of baby’s every move.

cubo ai


Cubo Ai Plus Smart Baby Monitor

The best AI baby monitor to safeguard your baby’s safety from 0-5 years+. AI detection for covered face, danger zone, cry detection, auto photo capture and lots more.

nannio comfy video baby monitor


Comfy Video Baby Monitor with Camera and Audio

Say goodbye to sleeping in separate bedrooms when you have the Nannio Comfy Video Baby Monitor. This monitor lets you see your baby's room from up to 1,000 feet away with it's long range Wi-Fi signal giving you peace of mind that they are safe and sound. With a 3.5" LCD screen, parents can watch their little one anytime they want in vivid detail- day or night!

lollipop smart camera turquioise


Smart Baby Monitor with True Crying Detection

You and your baby will love the Lollipop smart camera. With a non-invasive and gently contoured set of devices, you can both watch and be aware of all in your baby’s room wherever you might be. The system is smart, easy to set up and use, and gives you a window to look in on baby whenever you may need. Setting up the Lollipop is a breeze. Secure it to weefiee's crib, attach it to the wall or stand it up on a flat surface. 

nannio hero3


Hero3 Video Baby Monitor with Night Light

The NANNIO Hero3 Video Baby Monitor is the smartest, most reliable way to monitor your baby in their room or maybe even outside when they are in the backyard. The video camera connects wirelessly up to 900ft away wit crisp and clear images for crystal clear clarity. With two-way talk you can hear everything that happens in another room which includes 5 lullabies with 3 volume levels for any kind of sound preference.

hellobaby baby monitor


Baby Monitor,Hello Baby Monitor with Camera and Audio

Home care for the most precious. Our range of baby monitors bring you over 270 degree pan-tilt and zoom camera, two-way talk to provide crystal clear audio, all without breaking a piece out of your budget! The user-friendly controls make it easy for you to navigate through the features like night vision and nursery temperature monitoring.

owlet monitor duo 3 smart sock 3 cam


Baby Monitor Duo + New Smart Sock 3

The Owlet Monitor Duo combines the award-winning Smart Sock with the Cam for the most complete picture of your baby's well-being. Track your child's heart rate, oxygen level, and sleep trends, while streaming live HD video to your phone. View your child's readings in real time, from anywhere, in our free App and receive notifications if readings leave preset zones, and sound and motion notifications to stay informed of your child's needs.

ibaby m8


Ibaby M8 Baby Monitor

Use iBaby Care M8, our smart baby monitor, using industry-leading baby technology and built-in starry night moon and star projectors to bring your child to sleep. M8 is meticulously built and full of smart functions. It turns into a parenting assistant, allowing you to sit back and relax and help you parenting easily and happily. M8 includes a wall bracket.



VM819 Video Baby Monitor

Check in on your little one with a 2.8-inch LCD screen on the VTech VM819 Digital Video Baby Monitor. Soothe your baby using the lullabies and soft sounds that play right from the baby unit. Plus, you can make sure your infant is cozy by monitoring the nursery temperature that's displayed right on the LCD screen. Best of all, with the industry's best battery life, you can easily monitor your baby throughout the night with up to 19 hours of video streaming on one charge.

Uniden 4.3 inchDigital Wireless Baby Video Monitor with Remote Viewing via Smartphone App


BW3101 - 4.3” Digital Wireless Baby Video Monitor

From the range of award winning baby monitors, Uniden is pleased to introduce the latest in Wireless Video Monitoring Systems. This system has a large 4.3″ colour screen designed to monitor the safety of your sleeping baby or kids playing with an exceptionally user-friendly, high quality digital encrypted monitoring system. This Baby Watch even lets you view your child on a smart phone from anywhere in the world∧.

infant optics dxr8

Infant Optics

Infant Optics DXR-8 Video Baby Monitor with Interchangeable Optical Lens

The Infant Optics DXR-8 Video Monitor is the first baby monitor with interchangeable lens technology. Three separate lens types normal, wide angle (sold separately) and zoom allow you to choose the most suitable focal length and viewing angle for the specific environment, just like a professional camera system.

What Is The Future Of Baby Monitors?

A simple look at how the designs of baby monitors have evolved over the years confirm one thing: the basic premise upon which they operate is still pretty much the same. The units are meant to pick up sounds coming from the baby's room and transmit them to parents. So what does the future hold for baby monitors? Baby monitors are set to become even more popular over the next coming years with the market expected to grow at a rate of approximately 8.4% by 2026. The increased demand in the product is expected based on the following factors:

  • The percentage of the working population (aged between 25 and 54) is expected to increase to 64% by 2024. And since a large percentage of the reproductive age-group falls under this bracket, more working parents will be in need of the device.
  • Given the ever-growing digital landscape, more parents are turning to the internet for purchasing decisions. Companies are taking advantage of this fact and will increase their marketing efforts by enhancing the visibility of the baby monitor online.
  • Online awareness regarding infant safety is also expected to increase, which will, in turn, prompt parents to realize the unit's value.

Emerging Technology

MBP36 - Digital Video Baby Monitor MBP36It's not surprising given recent technological advancements that modern baby monitors now possess even more advanced features to make them more effective and valuable. Companies are always striving to create more innovative products. As such, the growth of the interactive baby monitor has taken over the market. Also, modern baby monitors now feature technology that is designed to ensure seamless signal transmission with minimal interference. Additional features found on modern units include:

  • Vibration alerts: Most modern baby monitors alert you via vibration alerts if your baby is in distress. This also means that deaf parents can take advantage of baby monitors too.
  • LED night lights: Some models feature LED lights that give off flashing signals when your baby is crying.
  • Alarms: Certain baby monitors sound off an alarm to notify you if your baby is crying or restless.
  • Ability to read room temperatures: Other baby monitors come complete with temperature sensors. They're designed to monitor the temperature in your baby's room to make sure that it's not too hot or cold.
  • Playing lullabies: If you're too tired to comfort your baby via the monitor, you can opt for units that are designed to play soothing music or lullabies.
  • Video functionality: But undoubtedly, the most significant feature incorporated in modern baby monitors is the video functionality. Parents can visually see their babies via the camera. Some models even go as far as allowing you to zoom in to get a better view of your baby.

Future Baby Monitors

Due to the nature of technological advancements, modifications to the baby monitors can only get better. The following features are expected to be present on all future baby monitors:

  • Medical apps that are responsible for monitoring your little one's ear temperature. As you know babies are prone to ear infections especially during their first years
  • Ability to track your baby's feeding schedule
  • ECG monitoring
  • Monitoring of oxygen levels

Once you fall down the rabbit hole into the world of baby equipment, you can begin to feel like you won't be a good parent unless you have all of the most up-to-date pregnancy, childbirth and childcare gear. This isn't true. The mom-to-be who talks to her bump from time to time is just as nurturing as the one who buys a specialist baby belly sound system with which to "stimulate" their babies development.

Believe it or not, moms even managed to hear their babies crying before baby monitors were invented and they coped just fine, for the most part, before most of our modern gear was available. 

It's interesting to see how baby monitors have evolved over the years. More parents are realizing the value of this unit when it comes to raising their little ones. Not only do the devices allow parents to monitor their children, but they also help ease their anxiety. Granted, there are concerns regarding the units' safety around babies, as some parents fear that modern baby monitors create too much radiation. But thankfully, more and more manufacturers are designing safe baby units that minimize radiation emissions. I strongly believe that technology should make us more efficient, and baby monitor tech should be looked at as something to embrace rather than to shun. With that said, would I recommend a baby monitor to a friend? For the peace of mind, the unit offers to every new parent, most definitely.

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