| Abbreviations | Meaning |
 | CAS | Congenital Alcoholic Syndrome |
| CMR | Congenital Mitral Regurgitation |
| CRB | Chemical, Radiological, And Biological; Congenital Retinal Blindness; Cramer-Rao Bound |
| CROME | Congenital Cataracts-epileptic Fits-mental Retardation (syndrome) |
| NHS-1 | First Natural History Study [of Congenital Heart Defects] |
| CAR | Congenital Articular Rigidity |
| CVT | Cardiovascular Technologist; Central Venous Temperature; Cerebral Venous Thrombosis; Congenital Vertical Talus |
| CDA | Congenital Dyserythropoietic Anemia |
| CASMD | Congenital Atonic Sclerotic Muscular Dystrophy |
| MACDP | Metropolitan Atlanta Congenital Defects Program |
| CHS | Congenital Hypoventilation Syndrome |
| CH | Congenital Hypothyroidism |
| CAD | Congenital Abduction Deficiency |
| CS | Congenital Syphilis |
| CHHS | Congenital Hypothalamic Hamartoma Syndrome |
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