Cerebral Palsy (CP)

What cerebral palsy is

"Cerebral" refers to the brain and "palsy" to weakness or problems controlling muscles. CP is caused by injury to the parts of the brain that control movement, most often the white matter around the fluid spaces (periventricular) or the motor cortex and deep brain structures.

Three features define it:

• The brain injury happened early, before about age 2.
• It does not progress. The injury does not spread or worsen. A child who is losing skills needs testing for another condition.
• Movement and posture are always affected. Many children also have other problems, such as epilepsy or learning difficulties, but these are not present in every case.

Early signs of cerebral palsy in babies

Most children are diagnosed between 12 and 24 months. High-risk babies, for example those born very early, can now often be identified by 3 to 6 months using standardized tools such as the General Movements Assessment and the Hammersmith Infant Neurological Examination.

Signs to mention to your pediatrician:

One sign by itself does not mean CP. Motor delays have many causes, and babies develop at different speeds.

Types of cerebral palsy

By movement type

By body area (spastic CP)

• Spastic diplegia: mainly the legs. Typical of premature babies. Many children walk, often with tight hamstrings and calves.
• Spastic hemiplegia: one side of the body, usually the arm more than the leg. Often from a stroke before or around birth.
• Spastic quadriplegia: all four limbs, trunk and often the face and mouth. The most severe form, usually with other health problems.

By function: GMFCS levels

Doctors describe how a child moves using the Gross Motor Function Classification System (GMFCS):

• Level I: walks without limits; may have trouble with speed and balance.
• Level II: walks with some limits, such as on uneven ground or stairs.
• Level III: walks with a handheld mobility device such as a walker or crutches.
• Level IV: limited self-mobility; uses a powered wheelchair in most settings.
• Level V: transported in a manual wheelchair; very limited head and trunk control.

The GMFCS level is fairly stable after age 2 and helps predict which therapy, equipment and hip checks a child needs.

What causes cerebral palsy

Most CP starts before birth. Lack of oxygen during delivery causes only a minority of cases, about 1 in 10.

Known causes and risk factors:

• Premature birth and low birth weight: the biggest risk factor. Babies born before 28 weeks have a far higher risk than full-term babies.
• Stroke before or around birth: a common cause of hemiplegic CP in full-term babies.
• Infections in pregnancy: cytomegalovirus, rubella, toxoplasmosis and infection of the placenta and membranes (chorioamnionitis).
• Brain malformations and some genetic changes, now found in a growing share of children.
• Multiple pregnancy: twins and triplets.
• Lack of oxygen around birth (hypoxic-ischemic encephalopathy).
• Severe newborn jaundice that damages the brain (kernicterus).
• After birth, before age 2: meningitis, head injury, near-drowning.

Prevention measures used today

Magnesium sulfate given to mothers in very preterm labor, cooling therapy for babies with oxygen deprivation at birth, rubella vaccination, and prompt treatment of newborn jaundice all reduce CP risk.

Problems that often come with CP

• Epilepsy: in about 1 in 3 children with CP.
• Intellectual disability: in about 1 in 2, more often with quadriplegia. Many children with CP have normal intelligence.
• Vision problems: squint, and visual processing difficulty (cortical visual impairment).
• Hearing loss and speech difficulties, including dysarthria (unclear speech from weak mouth muscles).
• Feeding and swallowing problems, drooling and reflux, which can cause poor growth and chest infections.
• Hip displacement: the hip can gradually slide out of its socket, especially at GMFCS levels III to V, so regular hip X-rays are recommended.
• Scoliosis, joint contractures, constipation, pain and sleep problems.

How cerebral palsy is diagnosed

There is no single blood test. A pediatrician or pediatric neurologist uses:

1. Developmental history, including pregnancy, birth and milestones.
2. Neurological examination of tone, reflexes, posture and movement quality.
3. Brain MRI, abnormal in about 80 to 90% of children with CP, showing the type and timing of injury.
4. Other tests where needed: genetic or metabolic tests if the MRI is normal, if there is a family history, or if skills are being lost. EEG if seizures are suspected. Hearing and vision tests for all.

Treatment

Care is led by a team: pediatrician, neurologist, physical, occupational and speech therapists, orthopedic surgeon and dietitian.

Therapy

• Physical therapy: strength, stretching, balance and walking practice. Early, goal-directed therapy in infancy makes use of the young brain's plasticity.
• Occupational therapy: hand use, dressing, feeding and equipment such as seating.
• Speech and language therapy: speech, swallowing safety, and communication aids such as picture boards or speech-generating devices.
• Constraint-induced therapy for hemiplegia, where the stronger arm is restrained so the child uses the weaker one.

Medicines and injections

• Botulinum toxin (Botox) injections relax specific tight muscles for 3 to 6 months, often combined with casting or splints.
• Oral medicines such as baclofen, diazepam or tizanidine for widespread spasticity. Trihexyphenidyl is used for dystonia.
• Intrathecal baclofen pump for severe spasticity or dystonia.
• Medicines for drooling, reflux, constipation and seizures.

Equipment and surgery

• Orthotics (ankle-foot braces), walkers, wheelchairs and standing frames.
• Orthopedic surgery to lengthen tight tendons, correct bone rotation, and reposition hips or straighten the spine.
• Selective dorsal rhizotomy: cutting selected sensory nerve rootlets in the lower spine to permanently reduce leg spasticity, for carefully chosen children with spastic diplegia.
• Gastrostomy tube when swallowing is unsafe or nutrition is poor.

Living with cerebral palsy and outlook

Most children with CP live into adulthood, and many have a normal or near-normal life expectancy, especially those who can walk. Life expectancy is shorter for people with severe disability (GMFCS level V), mainly from breathing and feeding complications.

Many adults with CP go to college, work and live independently. Adults often notice more pain, fatigue and stiffness and a decline in walking from their 30s or 40s, so continued physical activity and adult rehabilitation follow-up matter.

Frequently asked questions

What are the first signs of cerebral palsy in a baby?

Early signs include a head that lags when the baby is pulled to sitting, unusually stiff or floppy limbs, legs that scissor, persistent fisting, and strong early hand preference before 12 months. Delays in rolling, sitting and crawling are common. Your pediatrician can arrange a structured assessment if you are concerned.

Does cerebral palsy get worse with age?

The brain injury itself does not worsen. But muscle tightness, joint contractures, hip problems and scoliosis can develop as the child grows, and adults often feel more pain and fatigue. A child who loses skills they had should be checked for a different, progressive condition.

Is cerebral palsy genetic?

Usually not inherited in a simple way, but genetics play a bigger role than once thought. Genetic changes are found in a meaningful minority of children with CP, especially when the MRI is normal. Genetic testing is offered in these cases, and the result can affect family planning.

Can a child with cerebral palsy walk?

Many can. About 6 in 10 children with CP walk independently, and others walk with crutches or a walker. Children with hemiplegia or mild diplegia usually walk. The GMFCS level, which is fairly stable from age 2, gives the best guide to future walking.

What is the life expectancy for cerebral palsy?

Most people with CP live into adulthood, and those with mild CP often have a near-normal life span. Life expectancy is lower for people with severe motor disability, swallowing problems or tube feeding, mostly because of chest infections. Good nutrition and respiratory care improve outcomes.

Can cerebral palsy be cured?

No. The brain injury is permanent. However, treatment greatly improves function. Early therapy, spasticity management, equipment and well-timed surgery help children reach their full potential and prevent complications such as hip dislocation and contractures.