Hypotonia In Babies: Signs, Symptoms And Treatment


As parents, we all strive to ensure that our babies are healthy and happy. However, sometimes, despite our best efforts, our babies may experience health challenges. One such condition is hypotonia, which can be a cause of concern for parents. In this article, we will explore what hypotonia is, its signs and symptoms, causes, diagnosis, and available treatment options.

hypotonia in babies

In This Article:

Signs And Symptoms Of Hypotonia In Babies

Hypotonia, also known as floppy baby syndrome, is a condition that affects muscle tone and strength in babies. Babies with hypotonia have weak muscles, reduced muscle tone, and difficulty controlling their movements. Some of the signs and symptoms of hypotonia in babies include:

Floppy Or Limp Body

Babies with hypotonia may feel like they have less resistance when held or picked up. Their bodies may feel like they are made of jelly or lack the firmness we expect in a healthy baby.


Delayed Motor Milestones

Babies with hypotonia may have difficulty reaching motor milestones such as sitting up, rolling over, or crawling. They may also be slower to develop gross motor skills such as walking.

Difficulty Feeding

Low muscle tone can affect the muscles used for feeding, making it difficult for babies to suck, swallow, and breathe while feeding. This can lead to poor weight gain and malnutrition.

Weak Grip

Babies with hypotonia may have a weak grip and difficulty holding objects. This can affect their ability to explore and learn through play.

Joint Laxity

Hypotonia can also affect the joints, causing them to be loose and unstable. This can make it difficult for babies to maintain a stable posture or move their limbs in a coordinated manner.

Breathing Difficulties

Low muscle tone can affect the muscles used for breathing, leading to shallow breathing or pauses in breathing (apnea). This can be dangerous and requires immediate medical attention.


Causes of Hypotonia

There are several causes of hypotonia in babies. Some of the most common causes include:

Genetic Conditions

One possible cause of hypotonia in babies is a genetic condition. Some genetic disorders can lead to abnormal muscle tone and weakness. Examples of genetic conditions that can cause hypotonia include Down syndrome, Prader-Willi syndrome, and muscular dystrophy. 

Brain Abnormalities

Hypotonia can also be caused by abnormalities in the brain. Brain damage or malformations can affect the parts of the brain responsible for muscle tone and strength. Cerebral palsy, for example, is a condition that often leads to hypotonia. 


Premature babies, or babies born before 37 weeks of gestation, are at a higher risk of developing hypotonia. This is because their muscles may not have developed fully in the womb. Premature babies may need extra support and intervention to help them build strength and develop normal muscle tone.

Metabolic Disorders

Metabolic disorders can also lead to hypotonia in babies. These disorders affect the chemical processes that occur in the body, including the processes that provide energy to the muscles. Examples of metabolic disorders that can cause hypotonia include Pompe disease and mitochondrial disorders.


In some cases, hypotonia can be caused by physical trauma or injury. Birth injuries, such as a brachial plexus injury, can lead to muscle weakness and low muscle tone. Trauma to the brain or spinal cord can also cause hypotonia.



Certain infections can cause hypotonia in babies. Viral infections like cytomegalovirus and herpes simplex can affect the nervous system and lead to muscle weakness. Bacterial infections like sepsis can also cause hypotonia.

Diagnosis of Hypotonia

Diagnosing hypotonia can be challenging because it is not a stand-alone condition. It is often a symptom of an underlying condition. Therefore, doctors will need to conduct a series of tests to determine the cause of the hypotonia.

Physical Exam

One of the first tests that doctors may perform is a physical exam. They will check the baby’s muscle strength, reflexes, and range of motion. They may also check their eyes, ears, and mouth to rule out any other conditions that may be causing the hypotonia.

Additional Tests

If the physical exam does not provide enough information, doctors may order additional tests. These may include blood tests, genetic testing, and imaging tests such as an MRI or CT scan. These tests can help doctors identify the underlying cause of the hypotonia.


Treatment for Hypotonia in Babies

Once the underlying cause of the hypotonia is identified, doctors can develop a treatment plan. Treatment will depend on the specific condition causing the hypotonia. In some cases, there may be no cure, but treatment can improve the baby’s quality of life.

Physical Therapy

If the hypotonia is caused by a muscle or nerve disorder, physical therapy may be recommended. Physical therapy can help improve muscle strength and coordination. It may also help the baby develop gross motor skills such as rolling over, crawling, and walking.

Specialised Treatment

If the hypotonia is caused by a genetic disorder, there may be more specialized treatments available. For example, if the baby has a metabolic disorder, they may need to follow a special diet or take medication to manage their symptoms.


In some cases, surgery may be necessary to correct the underlying condition. For example, if the baby has a spinal cord abnormality, surgery may be needed to correct it.


As parents, it can be distressing to see your baby experience health challenges. Hypotonia is a condition that affects muscle tone and strength in babies, which can cause delayed development, poor muscle tone, feeding and breathing difficulties, and speech difficulties. However, it is important to note that there are available treatment options for hypotonia. If you suspect that your baby has hypotonia, it is important to seek medical advice from a healthcare professional. With the right treatment and support, babies with hypotonia can achieve their developmental milestones and live healthy and happy lives.


  1. https://my.clevelandclinic.org/health/diseases/22223-hypotonia-in-babies
  2. https://www.healthline.com/health/hypotonia
  3. https://www.medicalnewstoday.com/articles/hypotonia