Infant muscle weakness

Muscle Weakness in Infants (Hypotonia)

Muscle weakness, or hypotonia, is a reduction in muscle tone, causing the child to appear "floppy", "soft" or "flexible like a rag doll". It is important to distinguish this condition from general fatigue. Hypotonia is not a disease but a neurological symptom that can indicate a range of conditions, from benign to very serious.

How does hypotonia present in infants?

Besides the overall impression of "floppiness", parents may notice the following signs:

• Poor head control: The head "drops" backward or to the side.
• Motor development delay: The child begins to roll, sit, crawl later than usual. For more details see the article on developmental delays.
• Feeding difficulties: Weak oral and jaw muscles can lead to sluggish sucking.

Possible causes of muscle weakness

Causes can be central (related to the brain) or peripheral (related to nerves and muscles).

• Benign congenital hypotonia: A diagnosis of exclusion when examinations reveal no pathology.
• Genetic syndromes.
• Neuromuscular diseases.

If you notice signs of muscle weakness in your child, a consultation with a pediatric neurologist is required to determine the cause.