Kim Kardashian revealed her son Saint, 2, is back at home and recovering on Tuesday after being treated in hospital for pneumonia.
The reality TV star praised the resiliency of Saint, and said that their “end of year was challenging”.
Pneumonia is a type of acute respiratory infection, that affects the lungs.
The lungs are made up of tiny sacs, known as alveoli, that fill with air when a healthy person breathes. But, pneumonia causes the sacs to become full of pus and fluid, according to the World Health Organization (WHO).
GETTY ImagesPneumonia symptoms: Saint Kardashian received hospital care after pneumonia diagnosisRelated articles
Pneumonia is the single largest infectious cause of death in children worldwide
World Health Organization
“Pneumonia is the single largest infectious cause of death in children worldwide,” said the WHO.
“Pneumonia killed 920,136 children under the age of five in 2015, accounting for 16 per cent of all deaths of children under five years old.”
The condition is usually caused by a bacterial infection, form the bacterial Streptococcus pneumoniae.
But, it can also be caught by a virus, a fungus, or even by simply breathing in a harmful substance, including smoke.