<unk>  can be diagnosed as early as age one after a noticed delay in development, particularly a delay in rolling, crawling, sitting, or walking. However, depending on the severity, signs may not show up until the age of three. Muscle tone is sometimes used to make the diagnosis for<unk>  as affected children often appear to be either too stiff or too floppy. Another important diagnostic factor is the persistence of primitive reflexes past the age at which they should have disappeared (6–12 months of age). These reflexes include the rooting reflex, the sucking reflex, and the Moro reflex, among others. Magnetic resonance imaging (MRI) or a computed tomography scan (CT scan) may be used to locate the cause of the symptoms. Ultrasound may be used for the same function in premature babies. Because cerebral palsy refers to a group of disorders, it is important to have a clear and systematic naming system. These disorders must be non-progressive, non-transient, and not due to injury to the spinal cord. Disorders within the group are classified based on two characteristics- the main physiological symptom, and the limbs that are affected. For a disorder to be diagnosed as<unk> , an individual must show<unk>  symptoms (as opposed to athetotic, hypertonic, ataxic, or atonic symptoms) and it must be present in all four limbs (as opposed to hemiplegic, diplegic, or triplegic cases). While a diagnosis may be able to be made shortly after birth based on family history and observation of the infant, it is often postponed until after the child is between 18–24 months old in order to monitor the possible regression or progression of symptoms. Scientific classification The scientific classifications for these types include: Type OMIM Gene Locus CPSQ1 GAD1 2q31 CPSQ2 ANKRD15 9p24.3 CPSQ3 AP4M1 7q22.1
Spastic quadriplegia
Dissociated sensory loss
Hard flaccid syndrome
Triplegia
Klumpke paralysis
Upper motor neuron syndrome
Progressive bulbar palsy
Benign fasciculation syndrome