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PubMed This is a summary of 17 peer-reviewed journal articles Updated
Pediatrics

Early Warning Signs and Symptoms

At a Glance

The most common early sign of Congenital Muscular Dystrophy (CMD) is hypotonia, or low muscle tone, which causes babies to feel limp and miss physical milestones. Because it mimics conditions like cerebral palsy, an accurate diagnosis requires genetic testing like Whole-Exome Sequencing.

Identifying the early signs of Congenital Muscular Dystrophy (CMD) can be challenging because many symptoms overlap with other conditions. Because CMD starts at or near birth, the first signs often involve how a baby moves, breathes, or “feels” when held [1][2].

The “Floppy Baby” Presentation

The most common early warning sign of CMD is hypotonia, often described by parents and doctors as “floppy baby syndrome” [2].

  • Low Muscle Tone: Your baby may feel limp or “slippery” when held, as if they might slide through your hands [3].
  • Head Lag: When you lift your baby from a lying position, their head may fall back because the neck muscles are not strong enough to support it [2].
  • Delayed Milestones: You may notice your child is not hitting typical physical milestones, such as rolling over, sitting up, or crawling, on the usual timeline [4].

Beyond the Muscles: Subtle Early Signs

While muscle weakness is the hallmark, other early signs can be more subtle:

  • Feeding and Breathing: Weakness in the muscles used for sucking and swallowing can lead to feeding difficulties. Some infants may also have “quiet” breathing issues or a weak cry [5][6].
  • Joint Contractures: Some babies are born with joints that are “stuck” in a flexed or extended position, known as contractures [7][8].
  • Focal Weakness: Occasionally, weakness only appears in one area, like an arm or the neck, which can sometimes lead to an initial misdiagnosis of a birth-related injury [9].

Subtype-Specific “Red Flags”

In some cases, specific physical traits can provide clues about which genetic subtype a child has:

  • The “Velvety” Skin of Ullrich (COL6-RD): Children with Ullrich CMD often have very soft, “velvety” skin on the palms of their hands and soles of their feet [10]. They may also have small, rough bumps on their arms or legs (keratosis pilaris) and develop thick, raised scars called keloids [10].
  • The Rigid Spine (SEPN1-RD): This subtype is known for spinal rigidity, where the neck and back become stiff early on, making it difficult for the child to tuck their chin to their chest or bend their back [11][12].
  • Eye and Brain Changes: In some forms (dystroglycanopathies), doctors may find eye abnormalities like cataracts or structural changes in the brain that cause seizures [13][14].

Common Misdiagnoses

Because CMD is rare, it is frequently mistaken for other conditions during the first few months of life. Common “look-alike” conditions include:

  • Spinal Muscular Atrophy (SMA): Another genetic condition causing weakness, but it affects different parts of the nervous system.
  • Cerebral Palsy (CP): Often suspected when a baby has motor delays, but CP is caused by a brain injury rather than a primary muscle disease [9].
  • Brachial Plexus Injury: If a baby has weakness in only one arm, doctors might think it was caused by a difficult delivery rather than a muscular dystrophy [9].
  • Congenital Myopathies: These are a different group of muscle disorders that can look nearly identical to CMD without genetic testing [15].

Getting an accurate diagnosis through Whole-Exome Sequencing (WES) is the only way to distinguish CMD from these other conditions and ensure your child receives the correct care [16][17].

Common questions in this guide

What is the most common early sign of congenital muscular dystrophy?
The most common early warning sign is hypotonia, also known as low muscle tone. Babies with hypotonia may feel 'floppy' or limp, struggle to support their head, and miss physical milestones like rolling over or sitting up.
How is CMD different from cerebral palsy?
While both conditions cause early motor delays, cerebral palsy is typically caused by a brain injury before or during birth. In contrast, CMD is a genetic disease that primarily affects the muscles themselves. Genetic testing is required to tell them apart definitively.
Can skin changes be a symptom of muscular dystrophy?
Yes, in certain genetic subtypes like Ullrich CMD (COL6-RD), children may have unusually soft, velvety skin on their palms and soles. They might also develop rough bumps on their arms or legs, known as keratosis pilaris, or form thick scars called keloids.
What should I do if my baby feels floppy or slippery when held?
A 'slippery' feeling or a persistent head lag when you lift your baby can be signs of low muscle tone. You should discuss these observations with your pediatrician, who can evaluate your baby's development and refer you to a specialist if needed.
What does a rigid spine mean in a baby?
Spinal rigidity is an early stiffening of the neck and back, making it hard for a child to tuck their chin or bend their spine. This is a hallmark sign of a specific CMD subtype called SEPN1-RD.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.How do my child's symptoms differ from conditions like Spinal Muscular Atrophy (SMA) or Spinal Cord Injury?
  2. 2.Are the specific skin features I’m seeing (like 'velvety' palms) a hallmark of a certain genetic subtype like Ullrich CMD?
  3. 3.Does the 'stiffness' in my child's back indicate a rigid spine syndrome, and how does that affect their breathing monitoring?
  4. 4.If my child has focal weakness (only in certain areas), what tests can confirm this is CMD and not a localized injury like a brachial plexus injury?
  5. 5.How often should we be screening for 'hidden' symptoms like cardiomyopathy or nighttime breathing issues?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (17)
  1. 1

    The first report of two homozygous sequence variants in FKRP and SELENON genes associated with syndromic congenital muscular dystrophy in Iran: Further expansion of the clinical phenotypes.

    Mohamadian M, Naseri M, Ghandil P, et al.

    The journal of gene medicine 2020; (22(12)):e3265 doi:10.1002/jgm.3265.

    PMID: 32864802
  2. 2

    Broadening the paradigm of laminin α2-related muscular dystrophy: A case of partial merosin deficiency with compound heterozygous variants.

    Tavasoli A, Eghdami S, Kachuei M, Rouzbeh S

    SAGE open medical case reports 2025; (13()):2050313X251366020 doi:10.1177/2050313X251366020.

    PMID: 40874012
  3. 3

    The most severe form of LMNA-associated congenital muscular dystrophy.

    Murofushi Y, Hayakawa I, Abe Y, et al.

    Brain & development 2022; (44(9)):650-654 doi:10.1016/j.braindev.2022.05.006.

    PMID: 35729056
  4. 4

    Clinical and Genetic Landscape of Children With Congenital Muscular Dystrophies From North India.

    Basu A, Suthar R, Pandey A, et al.

    Journal of child neurology 2026; (41(5)):674-699 doi:10.1177/08830738251374530.

    PMID: 40982308
  5. 5

    Severe Neonatal RYR1 Myopathy With Pathological Features of Congenital Muscular Dystrophy.

    Helbling DC, Mendoza D, McCarrier J, et al.

    Journal of neuropathology and experimental neurology 2019; (78(3)):283-287 doi:10.1093/jnen/nlz004.

    PMID: 30715496
  6. 6

    ASC-1 Is a Cell Cycle Regulator Associated with Severe and Mild Forms of Myopathy.

    Villar-Quiles RN, Catervi F, Cabet E, et al.

    Annals of neurology 2020; (87(2)):217-232 doi:10.1002/ana.25660.

    PMID: 31794073
  7. 7

    Dropped head congenital muscular dystrophy caused by de novo mutations in LMNA.

    Karaoglu P, Quizon N, Pergande M, et al.

    Brain & development 2017; (39(4)):361-364 doi:10.1016/j.braindev.2016.11.002.

    PMID: 27876398
  8. 8

    Is the Next Generation Sequencing the Essential Tool for the Early Diagnostic Approach in Congenital Muscular Dystrophy? New Mutation in the Gen LMNA Associated with Serious Phenotype.

    Avila GM, González AP, Abad A, et al.

    Neurology India 2021; (69(6)):1835-1837 doi:10.4103/0028-3886.333448.

    PMID: 34979702
  9. 9

    Atypical Presentation of Congenital Muscular Dystrophy: A LAMA2 Related Muscular Dystrophy.

    Oswald S, Finch M, Schwaede A

    Journal of child neurology 2025; (40(8)):674-677 doi:10.1177/08830738251333467.

    PMID: 40296707
  10. 10

    Keratosis pilaris in collagen type VI-related disorders.

    Ritter AM, Wine Lee L

    Pediatric dermatology 2022; (39(1)):133-134 doi:10.1111/pde.14883.

    PMID: 34986511
  11. 11

    Selenoprotein N-related myopathy: a retrospective natural history study to guide clinical trials.

    Silwal A, Sarkozy A, Scoto M, et al.

    Annals of clinical and translational neurology 2020; (7(11)):2288-2296 doi:10.1002/acn3.51218.

    PMID: 33037864
  12. 12

    SEPN1-related Rigid Spine Muscular Dystrophy.

    Saini AG, Padmanabha H, Kumar S, et al.

    Indian journal of pediatrics 2018; (85(11)):1033-1034 doi:10.1007/s12098-018-2713-1.

    PMID: 29850975
  13. 13

    Characteristic Cochlear Hypoplasia in Patients with Walker-Warburg Syndrome: A Radiologic Study of the Inner Ear in α-Dystroglycan-Related Muscular Disorders.

    Talenti G, Robson C, Severino MS, et al.

    AJNR. American journal of neuroradiology 2021; (42(1)):167-172 doi:10.3174/ajnr.A6858.

    PMID: 33122211
  14. 14

    Seizures and EEG characteristics in a cohort of pediatric patients with dystroglycanopathies.

    Yang H, Song D, Liu Y, et al.

    Seizure 2022; (101()):39-47 doi:10.1016/j.seizure.2022.07.008.

    PMID: 35863218
  15. 15

    Compound Heterozygous Variants of GOSR2 Associated With Congenital Muscular Dystrophy and Progressive Myoclonus Epilepsy: A Case Report.

    Arroyo MS, Fuller C, Schorry EK, et al.

    Neurology. Genetics 2024; (10(4)):e200177 doi:10.1212/NXG.0000000000200177.

    PMID: 39035823
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    Genetic blueprint of congenital muscular dystrophies with brain malformations in Egypt: A report of 11 families.

    Safwat S, Flannery KP, El Beheiry AA, et al.

    Neurogenetics 2024; (25(2)):93-102 doi:10.1007/s10048-024-00745-z.

    PMID: 38296890
  17. 17

    Congenital muscle dystrophies: Role of singleton whole exome sequencing in countries with limited resources.

    Masri AT, Oweis L, Qudah AA, El-Shanti H

    Clinical neurology and neurosurgery 2022; (217()):107271 doi:10.1016/j.clineuro.2022.107271.

    PMID: 35533453

This page is for informational purposes only and does not replace professional medical advice. If you suspect your baby has delayed milestones or low muscle tone, consult your pediatrician immediately.

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