| AAP | | American Academy of Pediatrics |
| ABR | Respuesta auditiva del tronco del encéfalo | Auditory brainstem response |
| ACE | Enzima convertidora de angiotensina | Angiotensin-converting enzyme |
| ADMA | Dimetilarginina asimétrica | Asymmetric dimethylarginine |
| AEDV | Ausencia de EDV | absent EDV |
| aEEG | Electroencefalografía de amplitud integrada | Amplitude-integrated electroencephalography |
| AGA | Apropiado para la edad gestacional | Appropriate for gestational age |
| AIS | Accidente cerebrovascular isquémico arterial | Arterial ischemic stroke |
| AKI | Lesión renal aguda | Acute kidney injury |
| ALP | Fosfatasa alcalina | Alkaline phosphatase |
| ALRI | Infección aguda de vías respiratorias inferiores | Acute lower respiratory tract infection |
| ALT | Alanina aminotransferasa | Alanine aminotransferase |
| ALTE | Episodio con aparente amenaza para la vida | Apparent life-threatening event |
| ANC | Recuento absoluto de neutrófilos | Absolute neutrophil count |
| AOI | Apnea de la lactancia | Apnea of infancy |
| AOP | Apnea de la prematuridad | Apnea of prematurity |
| ARPKD | Nefropatía poliquística autosómica recesiva | Autosomal recessive polycystic kidney disease |
| ART | Tecnología de reproducción asistida | Assisted reproductive technology |
| AS | Estenosis aórtica | Aortic stenosis |
| ASD | Comunicación interauricular | Atrial septal defect |
| AST | Aspartato aminotransferasa | Aspartate aminotransferase |
| ATN | Necrosis tubular aguda | Acute tubular necrosis |
| BDP | Displasia broncopulmonar | Bronchopulmonary dysplasia |
| BIND | Disfunción neurológica inducida por bilirrubina | Bilirubin-induced neurologic dysfunction |
| BIO | Oftalmoscopia indirecta binocular | Binocular indirect ophthalmoscopy |
| BiPAP | Presión positiva en la vía respiratoria de dos niveles | Bilevel positive airway pressure |
| BMC | Contenido mineral óseo | Bone mineral content |
| BPP | Perfil biofísico | Biophysical profile |
| BUN | Nitrógeno ureico sanguíneo | Blood urea nitrogen |
| CAH | Hiperplasia suprarrenal congénita | Congenital adrenal hyperplasia |
| CAKUT | Anomalías congénitas del riñón y vías urinarias | Congenital anomalies of the kidney and urinary tract |
| CA-MRSA | MRSA extrahospitalarios | Community acquired MRSA |
| CA-MRSA | MRSA extrahospitalarios | community acquired MRSA |
| CAP | | Caffeine for Apnea of Prematurity |
| cART | Tratamiento antirretroviral combinado | Combination antiretroviral therapy |
| CBC | Complete blood count | Biometría hemática completa |
| CDC | | Centers for Disease Control and Prevention |
| CDG | Trastornos congénitos de la glucosilación | Congenital disorders of glycosylation |
| CDH | Hernia diafragmática congénita | Congenital diaphragmatic hernia |
| cEEG | Electroencefalografía continua | Continuous electroencephalography |
| CF | fibrosis quística | cystic fibrosis |
| CFRD | Diabetes mellitus relacionada con fibrosis quística | Cystic fibrosis-related diabetes |
| CGMS | Sistema de vigilancia subcutánea continua de la glucosa | Continuous glucose monitoring system |
| CGMS | Sistema de vigilancia subcutánea continua de la glucosa | Continuous glucose monitoring system |
| CH | Hipotiroidismo congénito | Congenital hypothiroidism |
| CH | Hidrocefalia congénita | Congenital hydrocephalus |
| CHD | Cardiopatías congénitas | Congenital heart disease |
| CHF | Insuficiencia cardiaca congestiva | Congestive heart failure |
| CHI | Hiperinsulinemia congénita | Congenital hyperinsulinemia |
| CHYLD | | Children with Hypoglycemia and Their Later Development |
| CLD | enfermedad pulmonar crónica | Chronic lung disease |
| CMTC | Piel marmórea telangiectásica congénita | Cutis marmorata telangiectatica congenita |
| CNLDO | Obstrucción congénita del conducto nasolagrimal | Congenital nasolacrimal duct obstruction |
| CNS | Síndrome Crigler-Najjar | Crigler-Najjar syndrome |
| COA | Coartación de la aorta | Coartación de la aorta |
| CONS | Estafilococos negativos a la coagulasa | Coagulase-negative staphylococci |
| CP | Parálisis cerebral | Cerebral palsy |
| CPAP | Presión positiva continua en las vías respiratorias | Continuous positive airway pressure |
| CPM | Mosaicismo confinado a la placenta | Confined placental mosaicism |
| CPR | Cociente cerebroplancentario | Cerebroplacental ratio |
| CPS | | Canadian Pediatric Society |
| CRRT | Tratamiento de sustitución renal continuo | Continuous renal replacement therapy |
| CRS | Síndrome de ... |