National Observatory of Children Hospitalized for Acute Respiratory Distress or Lower Respiratory Tract Infections

Inclusion Criteria: * Children under 12 months of age for bronchiolitis or under 24 months of age for pneumonia or under 24 months of age for asthma * Hospitalized in one of the 12 study sites * From October 15, 2023 * For acute bronchiolitis or pneumonia or asthma defined according to current national and international recommendations * Hospitalized from the pediatric emergency department. Exclusion Criteria: \- Refusal to participate by patient relative or legal representative