Danger Signs of Severe Disease in Infants

General Danger Signs (WHO Criteria)

The World Health Organization recommends immediate hospitalization for a 4-month-old infant with inability to drink or breastfeed, vomiting everything, convulsions, lethargy or unconsciousness, severe malnutrition, or stridor in a calm child 1, 2, 3
Inability to drink or breastfeed indicates severe dehydration or altered consciousness in infants 1, 2, 3
Vomiting everything prevents oral rehydration and medication in infants 1, 2, 3
Convulsions or history of convulsions are associated with severe infection or neurological compromise (OR 15.4 for severe illness) in infants 1, 2, 3
Lethargy or unconsciousness indicates altered mental status and severe systemic illness in infants 1, 2, 3

Grunting is a sign of severe respiratory distress, with an odds ratio of 2.9 for severe illness in infants 1, 4, 5, 2, 3
Persistent nasal flaring is a sign of consistent outward movement of nostrils during inspiration in infants 1, 4, 5, 2, 3
Head nodding indicates accessory muscle use in infants 1, 5, 2, 3
Tracheal tugging is a sign of soft tissue above sternum pulling inward during inspiration in infants 1, 5, 2, 3
Severe chest indrawing/intercostal retractions indicate tissue between ribs pulling inward, with an odds ratio of 8.9 for severe illness in 0-6 day olds 1, 4, 5, 2, 3
Stridor in a calm child indicates upper airway obstruction in infants 1, 2, 3
Respiratory rate ≥60 breaths per minute indicates severe tachypnea, with an odds ratio of 2.7 for severe illness in infants 1, 2, 3

Hypoxemia, defined as SpO₂ <90% at sea level, is a critical indicator requiring hospitalization in infants 1, 2, 6, 3
Central cyanosis indicates severe hypoxemia, with an odds ratio of 13.7 for severe illness in infants 6
Signs of dehydration, including decreased oral intake and poor skin turgor, are associated with severe illness in infants 6, 7

Chest indrawing alone in infants <2 years has decreased specificity for severe pneumonia, but when combined with signs of severe respiratory distress or hypoxemia, it indicates high mortality risk 5
Fever and tachycardia are common but non-specific and should not be relied upon alone for diagnosis in infants 1, 4
Tachypnea alone may be caused by fever, dehydration, or metabolic acidosis, not just respiratory disease in infants 6