The video shows a child with bronchiolitis (RS-virus). We can see typical signs of breathing difficulties such as rapid breathing and retractions. This is an important educational video which we recommend to parents.
The animation shows how the child's lungs are made up of large and small airways and lung tissue. In bronchiolitis, there is an inflammation in the linings of the tiniest branches of the airways, usually in children under 2 years. The linings swell up so that it is difficult for the child to breath, especially breathe out.