Signs of a Tethered Spinal Cord in Babies
The short answer
A tethered spinal cord occurs when the spinal cord is abnormally attached to the surrounding tissue, restricting its movement as the child grows. Signs include skin markers on the lower back (deep dimple, tuft of hair, skin tag, or hemangioma above the buttock crease), changes in bladder or bowel function, lower extremity weakness or asymmetry, and foot deformities. Diagnosis is made by MRI. Surgical untethering prevents progressive neurological damage.
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By Age
What to expect by age
Tethered cord may be suspected based on skin findings on the lower back. A simple sacral dimple within the gluteal crease is very common and usually normal. Dimples that are above the crease, deep, or associated with other skin findings (hairy patch, hemangioma, skin tag) may warrant ultrasound or MRI. Your pediatrician examines the lower back at every visit.
Spinal ultrasound can screen for tethered cord in young babies (before 3-4 months, the bones are not fully formed and allow ultrasound visualization). After 4-6 months, MRI is needed for definitive evaluation. If tethered cord is confirmed, your neurosurgeon will discuss timing of surgical release.
If diagnosed, surgery is typically recommended before motor milestones like walking begin to prevent neurological damage. The surgery (tethered cord release) is performed by a pediatric neurosurgeon. Recovery time is usually 1-2 weeks. Most babies have excellent outcomes when treated before symptoms develop.
Tethered cord may present with walking abnormalities, gait changes, or changes in bladder function as the child grows and the cord becomes more stretched. Toddlers may develop foot deformities or leg weakness. Prompt evaluation and surgery prevent further neurological damage.
Children with previously repaired tethered cord need ongoing monitoring as retethering can occur during growth. Symptoms of retethering include new or worsening lower extremity weakness, pain, or bladder dysfunction. Regular follow-up with neurosurgery is important.
What Should You Do?
When to take action
- A simple shallow sacral dimple within the gluteal crease (very common and usually normal)
- Your baby's lower back examination is normal with no concerning skin findings
- Normal bladder and bowel function and symmetric leg movement
- You notice a deep dimple, tuft of hair, skin tag, or unusual marking on your baby's lower back
- Your baby has asymmetric leg movement or one foot that seems different from the other
- Urinary incontinence that persists beyond expected toilet training age
- Sudden loss of leg function, new bladder or bowel incontinence, or rapidly progressive weakness
- Progressive neurological symptoms in a child with known tethered cord
Sources
Related Resources
Trust your instincts. If something feels wrong, reach out to your pediatrician.
Worrying about your baby means you care. That is a good thing.
Related Medical Concerns
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Hydrocephalus occurs when cerebrospinal fluid accumulates in the brain ventricles, causing increased pressure. In babies, the most noticeable sign is rapidly increasing head circumference (head growing faster than expected). Other signs include a bulging or tense fontanelle, prominent scalp veins, downward gaze of the eyes ("sunsetting"), irritability, vomiting, and developmental delays. Treatment typically involves surgical placement of a shunt or endoscopic third ventriculostomy to drain excess fluid.
When Should My Baby See a Pediatric Neurologist?
A pediatric neurologist specializes in disorders of the brain, spinal cord, nerves, and muscles in children. Referral is appropriate for seizures, abnormal head size or growth, significant hypotonia or hypertonia, developmental regression, movement disorders, headaches, suspected neuromuscular conditions, and abnormal neurological examination findings. These specialists perform detailed neurological evaluations and may order EEGs, MRIs, and other specialized testing.
My Baby's Head Shape Looks Abnormal
Many babies develop temporary head shape irregularities that are completely normal. A cone-shaped head from vaginal delivery reshapes within days. Mild positional flattening (plagiocephaly) from sleeping on the back is very common and usually improves with repositioning and tummy time. However, head shape changes involving ridges, a persistently bulging fontanelle, or rapid head growth changes should be evaluated to rule out craniosynostosis.
Achondroplasia (Dwarfism) in Babies
Achondroplasia is the most common form of short-limbed dwarfism, affecting about 1 in 15,000 to 40,000 births. It is caused by a mutation in the FGFR3 gene and is usually apparent at birth with characteristic features including short limbs, a larger head, and a prominent forehead. Intelligence is normal. With monitoring for specific complications and supportive care, children with achondroplasia lead full, active, and independent lives.
Adenoid Hypertrophy and Breathing
Adenoids are lymphoid tissue located behind the nose that help fight infection in young children. When adenoids become enlarged (adenoid hypertrophy), they can block the nasal airway, causing chronic mouth breathing, snoring, nasal speech, and sleep-disordered breathing. Enlarged adenoids are most common between ages 2-7 and are a leading cause of obstructive sleep apnea in young children. Treatment ranges from watchful waiting and nasal steroids to surgical removal (adenoidectomy) if breathing or sleep is significantly affected.
How to Advocate for Your Child's Needs
You know your child better than anyone, and your observations matter. If you feel something is not right with your child's development or health, you have every right to ask questions, request evaluations, and seek second opinions. Advocating for your child is not being difficult - it is being a good parent.