For children with developmental delay, the first visit usually requires a cranial MRI pelvic radiograph to rule out visual and auditory impairment, peripheral blood chromosomes, blood biochemistry, blood ammonia, hydrophobic acid-base set, and a complete set of nail gong, followed by further tests such as spinal MRI, X-ray of the spine or lower extremities, genetic metabolic screening, and even genetic testing for associated motor developmental delays or cognitive deficits, depending on the physician’s examination and the characteristics of the child.