CP is a group of
chronic childhood motor impairments.
A wide range of genetic etiologies cause abnormal fetal brain development as early as 3-9 weeks after conception. A pediatric neurologist would compare the siblings' clinical findings, abnormalities on MRI
of the brain & EEG
, growth & developmental trajectories & results of their Chromosomal Microarrays & DNA
Probes for Fragile X, then refer to a geneticist.