There is a human-to-human transmission of novel coronavirus infection pneumonia, and the population is generally susceptible to it, but children are less likely to go out and have less exposure to the virus, so the clinical incidence is lower in children. However, on January 26, the official microblog of the Beijing Municipal Health Commission released news that one of the new pneumonia cases of novel coronavirus infection in Beijing was a 9-month-old baby with a history of exposure to the infected area. The child was diagnosed with the new coronavirus on the 25th and the 26th, which is the youngest known patient with the new coronavirus.