Global Developmental Delay refers to a child's delayed progress in reaching developmental milestones compared to other children their age. Full definition
This syndrome causes global developmental delay, with intellectual disability and autism spectrum disorder features. (lerner.ccf.org)
Reimschisel T. Global developmental delay and regression. (medlineplus.gov)
Christianson syndrome (CS) is a novel, X-linked developmental brain disorder, clinically recognized by the symptoms of global developmental delay, intellectual disability, ataxia, epilepsy, non - or minimally verbal status, ophthalmoplegia and most often postnatal microcephaly [1]. (jneurodevdisorders.biomedcentral.com)