Congenital Muscular Dystrophy (CMD): Symptoms in Newborns and Infants

Written by the Muscular Dystrophy Pakistan (MDP) content team. Based on information from Cleveland Clinic, Muscular Dystrophy News, NINDS and published research (see sources below). Last updated: October 16, 2026.

"My baby feels floppy, like a rag doll." "She hardly moves her arms and legs." "He cries weakly and takes a long time to feed." These are the words of many parents of babies with congenital muscular dystrophy (CMD). Unlike most muscular dystrophies, which appear later in childhood or adulthood, CMD shows up at birth or in the first months of life. In many families, especially when the baby looks otherwise healthy, the signs are explained away as "weakness", "a lazy baby" or "he will grow out of it". This guide explains CMD in simple words: what it is, what causes it, its main types, how to recognise the signs in newborns and infants, how it is diagnosed, and what care is available.

Quick facts

• CMD is a group of genetic muscle diseases in which muscle weakness is present at birth or begins in the first two years of life.
• Almost all types are inherited in an autosomal recessive pattern: both parents are healthy carriers, and each pregnancy has a 25% chance of an affected child.
• The most common signs are a floppy baby (hypotonia), little spontaneous movement, a weak cry, feeding difficulty and tight joints.
• Some types also affect the brain, eyes or breathing, so the exact type matters.
• CMD affects boys and girls equally, and there is no cure yet, but good supportive care changes quality of life.

What Is Congenital Muscular Dystrophy?

Congenital muscular dystrophies are a group of inherited conditions in which the muscles are weak from birth or soon after, and symptoms usually appear before the child is able to walk. They are caused by changes in genes that make proteins needed to keep muscle fibres stable. Because there are many genes involved, CMD is a very varied group: some children are severely affected from the first days of life, while others are mildly affected and walk independently.

CMD is not contagious, it is not caused by anything the mother did or did not do during pregnancy, and nobody is to blame. It is a medical condition written in genes.

What Causes CMD and How Is It Inherited?

Each type of CMD is caused by a change in a different gene. For example, in LAMA2-related CMD, the gene for a protein called laminin alpha-2 is affected, and in collagen VI-related CMD, the genes for collagen VI are affected. These proteins form part of the "scaffolding" around muscle fibres. When they are missing or faulty, muscle fibres are easily damaged and weaken from the start.

Almost all types of CMD are inherited in an autosomal recessive way. This means:

• A child is affected only when the child inherits a changed copy of the gene from both parents.
• The parents are usually healthy carriers and have no symptoms, so the family may never have heard of the condition before.
• With each pregnancy, there is a 25% chance of an affected child, a 50% chance of a healthy carrier child, and a 25% chance of a child who is neither affected nor a carrier.
• Boys and girls are equally affected.
• Recessive conditions are more likely when the parents are related, which is relevant in Pakistan, where about half of all marriages are between first cousins.
• Some forms, such as certain collagen VI-related types, can also be caused by a new (de novo) change, with no earlier family history.

Main Types of CMD

Type	Gene / protein	Key features
LAMA2-related (MDC1A, merosin-deficient)	LAMA2 / laminin alpha-2	Among the most common types. Severe weakness from infancy, many children do not walk, joint contractures, breathing problems. Changes in the brain's white matter on MRI. Seizures in about one-third. Intelligence is often normal. CPK is raised
Collagen VI-related (Ullrich, intermediate, Bethlem)	COL6A1, COL6A2, COL6A3	Ranges from severe to mild. Loose joints in the hands and feet together with tight joints at the hips, knees and elbows, soft skin on the palms. CPK is normal or only mildly raised
SEPN1-related (rigid spine)	SEPN1 (SELENON)	Weak neck and trunk muscles, stiff spine, curved spine, early breathing weakness. Most people can walk. Progress is often slow
Alpha-dystroglycan-related	FKRP, FKTN, POMT1 and others	A wide range from very severe forms with brain and eye involvement to milder forms. Some affect learning and development. Heart involvement is possible in some
Other types	Several genes	Rarer types are still being described. Some children have no confirmed genetic diagnosis yet

The percentage of each type differs between countries. The LAMA2, collagen VI and alpha-dystroglycan groups are the most common worldwide. A recent study of Pakistani families with muscular dystrophy also found a congenital type called MDC1A, showing that CMD is present in Pakistan.

Symptoms in Newborns and Infants

• Floppiness (hypotonia): The baby feels limp and "like a rag doll" when picked up, and head control is poor.
• Little spontaneous movement: The baby moves the arms and legs less than expected.
• Weak cry: The cry is soft or weak.
• Feeding difficulty: A weak suck, slow feeding, choking or coughing during feeds, poor weight gain.
• Breathing problems: Weak breathing, especially during sleep or with chest infections, in some types.
• Tight or fixed joints (contractures): The elbows, knees, hips or ankles may be stiff and hard to straighten.
• Delayed milestones: Late rolling, sitting, standing or walking, and in some types the child never walks independently.
• Other features in some types: Seizures, delayed speech or learning, eye problems, a curved spine or a stiff neck.

Not every floppy baby has CMD. Many other conditions, including infections, thyroid problems, nerve conditions and other genetic conditions, can cause floppiness, and some babies are simply late developers. But a baby who is floppy, weak and not meeting milestones should be seen by a paediatrician or paediatric neurologist without delay.

How Is CMD Diagnosed?

• Examination and history: The doctor checks muscle tone, strength, reflexes, joints and breathing, and asks about pregnancy, birth, family history and relatives with similar problems or consanguinity.
• CPK blood test: Very high in some types (such as LAMA2), but normal or mildly raised in others (such as collagen VI and SEPN1), so a normal CPK does not rule out CMD.
• MRI of the brain and muscles: A brain MRI can show typical changes in the white matter in LAMA2-related CMD, and muscle MRI patterns can help to narrow down the type.
• Genetic testing: The key test. A panel of CMD genes or exome sequencing finds the exact change, confirms the type and helps with counselling and family planning.
• Muscle biopsy: A small piece of muscle can be stained for proteins such as laminin alpha-2 or collagen VI. It is used when genetic tests are not available or are unclear.
• Other checks as needed: Breathing and sleep tests, heart tests, eye and hearing checks, and an EEG if seizures occur.

Many conditions can mimic CMD, so a confirmed genetic diagnosis is very valuable. It tells the family which organs to monitor, the risk for future children, and whether any trials may apply.

Care and Management

There is no cure for CMD at present. Care aims to support breathing, feeding, comfort and development, and works best through a team: a paediatric neurologist, a lung specialist, a nutrition and feeding specialist, an orthopaedic doctor and others as needed, with the family as the central partner.

• Breathing: Regular breathing and sleep checks, prompt treatment of chest infections, vaccines (flu, pneumococcal), and breathing support at night when needed. Breathing care is one of the most important factors for health and survival in several types.
• Feeding and nutrition: A feeding specialist can help with safe swallowing and weight gain. Some children need tube feeding for a time, which helps them to grow and protects the lungs from choking.
• Joints and spine: An orthopaedic doctor monitors tight joints, hips and curvature of the spine and advises when treatment is needed.
• Brain and development: Seizure treatment if seizures occur, and support for speech, learning and play according to the child's needs.
• Eyes and hearing: Regular checks, particularly in types that involve the brain and eyes.
• Heart: Heart checks in the types where the heart can be involved.
• Safety with anaesthesia: Always tell every doctor, dentist and anaesthetist about your child's diagnosis before any procedure.
• Family support: Parents of a child with CMD carry a heavy load. Connecting with other families, sharing the care among relatives, and asking for emotional support are all important.

What Is the Outlook?

CMD is a very varied group, and outlook depends on the exact type. In some severe types, breathing and feeding problems can be life-limiting in early life. In others, children live into adulthood and some walk independently. Good breathing and feeding care has improved health and survival in many types. Because no single number applies to all children, the best source of information about your child is the specialist who knows the exact type. We do not have reliable survival data for Pakistan.

Research and New Treatments

Research on CMD is growing. Scientists are studying drugs that could protect muscle, gene-based approaches and treatments for specific types, such as LAMA2-related CMD. Most work is at an early or clinical-trial stage, and none is available in Pakistan at present. A confirmed genetic diagnosis is usually the first requirement for joining a trial.

Family Planning and Genetic Counselling

When parents have had one child with a recessive type of CMD, each future pregnancy has a 25% chance of being affected. Brothers and sisters of the affected child may be carriers, and they can be offered carrier testing later in life once the family's gene change is known. Options for future pregnancies depend on availability and on each family's own values, and a genetic counsellor can explain them. These decisions always belong to the family.

CMD in Pakistan

In Pakistan, parents of floppy babies are often told to "wait", to give more milk and vitamins, or to try massage or a tonic, while the months pass. Many babies are never given a genetic diagnosis. Because about half of all marriages are between cousins, and most CMD types are recessive, families may meet CMD more than once. Pediatric neurology and genetic testing are mostly available in major cities and can be costly, so ask your paediatrician early for a referral. If your baby is floppy or late in reaching milestones, do not wait. Ask for a CPK test, a neurology review and genetic testing. MDP is collecting patient data on its registration portal, so please register if your child has CMD or another muscular dystrophy.

Frequently Asked Questions

What does "congenital" mean?

It means present at birth or beginning in the first months of life. It does not always mean the baby looks unwell right after birth.

Is CMD the same as Duchenne?

No. Duchenne is X-linked, mostly affects boys and usually shows signs at 2 to 5 years. CMD starts at birth or in infancy, affects boys and girls equally and is mostly autosomal recessive.

Will my child walk?

It depends on the type. In some types, such as many SEPN1-related cases, most people walk. In severe LAMA2-related or collagen VI-related types, many children do not walk or walk only for a time.

Is my child's intelligence affected?

In some types, such as LAMA2-related CMD, intelligence is often normal even though the MRI shows changes. In other types, especially some alpha-dystroglycan-related ones, learning and development can be affected. Your specialist can explain.

Can CMD be treated?

There is no cure yet. Supportive care for breathing, feeding, joints and development makes a real difference.

Can we have another healthy child?

Yes, many families do. For a recessive type, each pregnancy has a 25% chance of being affected and a 75% chance of an unaffected child. A genetic counsellor can explain options.

Which test confirms the diagnosis?

A genetic test, such as a CMD gene panel or exome sequencing. A CPK test, MRI and sometimes a muscle biopsy support it.

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A Floppy Baby Deserves Answers

A floppy baby is not a "lazy" baby, and weak muscles at birth are never normal. The sooner a baby has a diagnosis, the sooner the family can get the right care, plan for the future and protect other children. If you are worried about your baby's muscle tone, feeding or movement, ask for a proper check, and keep asking until you have answers. Follow the MDP blog for our guides on each type of muscular dystrophy, and share this article with a parent who may need it.

Sources and Further Reading

• Cleveland Clinic, Congenital Muscular Dystrophy (CMD)
• Muscular Dystrophy News, Congenital Muscular Dystrophies
• Merosin-deficient congenital muscular dystrophy type 1a: detection of LAMA2 variants in Vietnamese patients, PubMed Central
• Merosin-deficient congenital muscular dystrophy type 1A: a case report, PubMed Central
• Clinico-genetic heterogeneity in Pakistani families affected with muscular dystrophies, PubMed Central
• National Institute of Neurological Disorders and Stroke (NINDS), Muscular Dystrophy information page

Medical disclaimer: This article is for awareness and education only. It is not a substitute for professional medical advice, diagnosis or treatment. If you are worried about your baby's health, please consult a qualified doctor.