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Causes of the ill-appearing young infant (<90 days of age)*

Causes of the ill-appearing young infant (<90 days of age)*
Infections
  • Bacterial sepsis due to:
    • Urinary tract infection/pyelonephritis
    • Bacteremia
    • Meningitis
    • Pneumonia
    • Cellulitis or skin abscess
    • Bacterial gastroenteritis
    • Omphalitis
    • Mastitis
    • Septic arthritis
    • Osteomyelitis
  • Pertussis (apnea)
  • Infant botulism
  • Overwhelming viral illness due to:
    • Disseminated herpes simplex virus infection
    • Enterovirus and parechovirus (meningoencephalitis, myocarditis or hepatitis)
    • Cytomegalovirus (pneumonitis and hepatitis)
    • Bronchiolitis (apnea)
    • Influenza
Acute bilirubin encephalopathy
Cardiac conditions
  • Congenital heart disease:
    • Cyanotic
    • Obstructive
    • Aberrant coronary artery
  • Supraventricular tachycardia and other arrhythmias (leading to heart failure)
  • Kawasaki disease
Child abuse
Endocrine
  • Congenital adrenal hyperplasia
Glucose and electrolyte abnormalities
  • Hypoglycemia
  • Hyponatremia
  • Hypernatremia
  • Hypocalcemia
Hypothermia (environmental exposure)
Inborn errors of metabolism (eg, urea cycle defects, galactosemia, organic acidemias, disorders of carbohydrate metabolism, or disorders of fatty acid oxidation)
Surgical conditions
  • Congenital aganglionic megacolon (Hirschsprung disease) with acute obstruction or enterocolitis
  • Gonadal torsion
  • Incarcerated or strangulated hernia
  • Intussusception
  • Malrotation with volvulus
  • Meconium ileus (cystic fibrosis)
  • Necrotizing enterocolitis
  • Neonatal appendicitis
  • Pyloric stenosis with hypokalemic, hypokalemic metabolic alkalosis and dehydration
Toxic exposures
  • Environmental toxins (carbon monoxide poisoning or methemoglobinemia from nitrate or other oxidant exposure)
  • Ingestion of substances in breast milk (eg, maternal drugs of abuse such as heroin, cocaine, phencyclidine [PCP], or marijuana)
  • Malicious drug exposure (eg, ethanol, drugs of abuse, or other medications [medical child abuse])
  • Medication error (eg, acetaminophen, methadone, or metoclopramide)
  • Methemoglobinemia due to severe dehydration and metabolic acidosis
  • Neonatal abstinence syndrome
* Refer to UpToDate topics on the ill-appearing infant younger than 90 days of age.
¶ Risk factors for urinary tract infection (UTI) in young infants include galactosemia and posterior urethral valves.
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