Colin Snow
Newborns can be incredibly loud sleepers, and there are several reasons why. Firstly, newborns go through two different sleep cycles: quiet sleep and active sleep, spending about half of their sleeping time in each. During active sleep, newborns move around, make noise, and sometimes even open their eyes, all while they're sleeping. Their immature digestive systems are also a factor, as they are just learning how to regulate their bowel movements, resulting in noisy grunting and straining. Additionally, newborns primarily breathe through their noses, and their small nasal passages can easily become congested, leading to louder breathing sounds. While most sleep sounds are normal, some noises, such as rapid breathing or grunting at the end of every breath, may indicate sickness or distress and require medical attention.
| Characteristics | Values |
|---|---|
| Sleep cycles | Newborns go through two different sleep cycles: quiet sleep and active sleep, and they spend about half of their sleeping time in each |
| Active sleep | Similar to REM sleep for adults, but the skeletal muscles are not paralyzed. Instead, babies move around, make noise (grunting noises and cries), and sometimes even open their eyes, all while they're actually sleeping |
| Development | Newborns' respiratory and digestive systems are not fully developed yet, so they make extra sleep sounds |
| Nasal breathing | Newborns breathe through their nose, and their airways are small. Congestion and dry or swollen nasal membranes can clog up the works, making breathing audible |
| Sleep transitions | Newborns cycle through just sleep stages—REM sleep (aka “active sleep”) and NREM “quiet sleep”—every 45 to 50 minutes |
| Immature digestive system | Newborns have an immature digestive system, which can cause them to make noises like grunting, growling, squeaking, and squawking |
| Weak core muscles | Newborns have weak core muscles, which can make it difficult for them to pass gas |
| Illness | Illness can contribute to the noises babies make when they sleep |
| Gut maturity | As babies mature, their gut develops and they make less noise when sleeping |
| Laryngomalacia | Some babies may have laryngomalacia, a floppy airway that causes loud breathing sounds, especially when laying flat on their back |
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What You'll Learn
Newborns have short sleep cycles
The short sleep cycles of newborns contribute to their frequent sleep-wake disruptions. Newborns are constantly transitioning between sleep stages, which explains why they may be noisy upon falling asleep and then again when they wake up about an hour later. This sleep pattern can be challenging for new parents, as it may result in fragmented sleep for both the newborn and the caregivers.
During active sleep, newborns are known to make various noises, including grunting, moaning, crying out, and lip-smacking. These sounds are often associated with the maturation of their digestive system and the regulation of bowel movements. Newborns also breathe faster than older children and adults, with a breathing rate of about 40 to 60 breaths per minute, slowing to 30 to 40 breaths per minute during sleep. This rapid breathing, combined with their smaller nasal passages, can lead to congestion and audible breathing.
As newborns' bodies are still developing, their respiratory and digestive systems are not yet fully mature. This results in extra effort and, consequently, extra sleep sounds. For example, newborns are learning to regulate their breathing, which can lead to periods of rapid or slowed breathing. Additionally, their immature digestive systems can cause noisy bowel movements and passing of gas.
As newborns grow, their sleep cycles gradually mature. By three to six months of age, they start spending more time in deep sleep and less time in active REM sleep. Their overall sleep cycles lengthen, resulting in fewer disruptions. Additionally, their digestive systems mature, contributing to a reduction in sleep noises.
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They're learning to regulate breathing
Newborns can be noisy sleepers, and one reason for this is that they are learning to regulate their breathing. Breathing is a complex process that requires coordination between various muscles and nerve signals, and it is something that newborns are still mastering in the early days and weeks of life. During sleep, a newborn's breathing pattern can be irregular, with periods of fast, slow, or paused breathing. This is because they are still learning to coordinate the signals from their brain to their diaphragm and chest muscles, which control inhalation and exhalation. As a result, you may hear them taking big gasps of air, snoring, or making other loud noises as they sleep. These noises can be concerning for new parents, but they are usually perfectly normal and indicate that your baby is learning to breathe effectively.
Newborns tend to breathe primarily through their noses, and they are adapting to the feeling of air passing through their nasal passages. This can cause them to snuffle or snore as they sleep. They are also learning to manage the secretion of mucus, which can lead to congestion and noisy breathing. Additionally, the position of a newborn's head and neck can affect their airway and cause them to sound noisy or congested, even if their noses are clear. All of these factors contribute to the loud breathing associated with sleeping newborns.
Another aspect of breathing regulation that newborns are learning is the control of carbon dioxide levels in the body. The body's response to carbon dioxide levels is a critical factor in regulating breathing. Newborns are sensitive to even slight changes in carbon dioxide levels, and their brains are still learning to interpret and respond to these signals appropriately. As a result, they may exhibit periods of rapid breathing (known as tachypnea) or temporary pauses in breathing (known as apnea). These irregular breathing patterns can be disconcerting for new parents, but they are typically normal and resolve as the baby matures.
It's important to monitor your newborn's breathing, especially during sleep, and consult a healthcare professional if you have any concerns. While loud breathing is usually a normal part of a newborn's development, there are certain warning signs to look out for. These include persistent tachypnea (rapid breathing), labored or difficult breathing, grunting with each breath, flaring of the nostrils, or a bluish tint to the skin. These symptoms could indicate respiratory distress or other underlying conditions that require medical attention. Overall, it's essential to be vigilant and trust your instincts when it comes to your baby's health.
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Their digestive system is immature
Newborns are loud sleepers because their digestive system is immature. Their gut is still maturing and becoming more efficient, and they have weak core muscles and are not very coordinated yet. This makes it difficult for them to pass gas, which results in a lot of noise, such as grunting, growling, squeaking, and squawking. This is sometimes called "grunting baby syndrome", and it is completely normal. As their digestive system matures, they will become less noisy sleepers.
Newborns also tend to make noise when they sleep because they are still learning how to regulate their breathing. Their nasal passages are tiny, so any small obstruction, such as mucus, breastmilk, or formula, can cause congestion and make their breathing louder. They also breathe more quickly than adults because they have smaller lungs and can't hold as much air and oxygen. Their breathing is not rhythmic, and they tend to take many rapid and shallow breaths.
The digestive system of a newborn is still developing, and they are learning vital skills like digestion even when they are sleeping. This can result in a lot of movement and noise, including grunting, moaning, and occasionally crying out. Their abdominal muscles are still getting used to moving poop and gas through their system, which can cause them to grunt in their sleep.
Newborns also tend to be noisy poopers because they have not yet learned to relax their pelvic floor or use their tummy muscles to move their bowels quietly. This can result in noisy grunting and straining. Additionally, passing wind or having a bowel movement can also cause a baby to be noisy when sleeping.
The maturation of a baby's digestive system and gut health is a gradual process, and it is normal for babies to be noisy sleepers during this time. By the time a baby is between 3 and 6 months old, their sleep cycles will have started to mature, and they will spend more time in deep sleep, resulting in fewer disruptions.
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They're congested
Newborns are noisy sleepers due to several biological factors. One common reason is congestion, which can be caused by various factors and typically resolves without treatment.
Newborns are "obligate nose breathers", meaning they can only breathe through their mouths when crying. The rest of the time, they breathe through their noses, which are tiny and can easily become congested. This congestion can be caused by swelling of the nasal passages or by mucus buildup, leading to snoring, snorting, whistling, and rattling sounds during sleep. Preemie babies, with even smaller air passages, are more prone to noisy breathing.
Environmental factors can also contribute to congestion. Air irritants such as smoke, perfumes, or household cleaning products can irritate a baby's nasal passages. Dry air and low humidity can have a similar effect, drying out and irritating the nasal passages. Additionally, weather changes, particularly the transition from summer to colder months, can increase the likelihood of congestion.
While congestion in newborns is common and often harmless, it can sometimes be a sign of illness or infection. If your baby is congested and not eating well, it's important to watch for signs of dehydration, such as a reduced number of wet diapers, a lack of tears when crying, and excessive tiredness. In such cases, it is recommended to consult a pediatrician.
To alleviate congestion, home remedies such as warm baths, saline drops, and clean air can be helpful. Using a cool mist humidifier in the room and a nasal saline spray can also help moisturize and clear the nasal passages. However, it is important to consult a healthcare professional if you have concerns or if the congestion persists or is accompanied by other symptoms.
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They're noisy poopers
Newborns are noisy poopers because they are still getting used to using their abdominal muscles to move gas and poop through their system. They are not yet adept at relaxing their pelvic floor or using their tummy muscles to help move their bowels quietly. This results in noisy grunting and straining when they have a bowel movement.
Newborns are also noisy sleepers because they are still developing. Their respiratory and digestive systems are not fully developed yet, so they are working extra hard to get their jobs done. With all that extra work, there are extra sleep sounds, too. For instance, since babies are just learning how to regulate their breathing, you’ll likely overhear brief periods when their breathing speeds up or slows down when they’re sleeping.
Newborns go through two different sleep cycles: quiet sleep and active sleep, and they spend about half of their sleeping time in each. During active sleep, babies move around, make noise (grunting noises and cries), and sometimes even open their eyes, all while they're actually sleeping. Their brain and body are still working hard to learn vital skills, like digestion, even when they’re sleeping. With all of that hard work and development happening during active sleep, we can expect to see your baby consistently moving as well as making grunting sounds, moaning, and even occasionally crying out.
Most babies don't burp unless they're awake. Some babies will wake and cry when they have a dirty nappy, and others aren't bothered by it. Follow the baby's lead when it comes to changing them - if they wake up, that's a cue that they're uncomfortable and need to be changed.
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Frequently asked questions
Newborns are noisy sleepers because their body systems are still developing and learning to work. Their nasal passages are tiny, so any small obstruction can make their breathing sound louder. They also breathe faster than adults, and their breathing is not rhythmic. Newborns also spend a lot of time in active sleep, during which they move around, make noise, and sometimes even open their eyes, all while they're sleeping.
Newborns make a variety of noises while sleeping, including grunting, groaning, squeaking, snoring, hiccupping, coughing, and lip-smacking. These noises are usually normal and are caused by the maturation of their digestive and respiratory systems.
Newborns usually become less noisy after the first few months as their sleep cycles mature and they spend less time in the REM/"active" stage of sleep. By the time a baby is between 3 and 6 months old, they will be spending more time in deep sleep and their overall sleep cycles will lengthen.
