https://www.scientificamerican.com/article/how-do-children-spread-the-coronavirus-the-science-still-isnt-clear/

The role of children in spreading the coronavirus has been a key question since the early days of the pandemic. Now, as some countries allow schools to begin reopening after weeks in lockdown, scientists are racing to figure this out.

Children represent a small fraction of confirmed COVID-19 cases—less than 2% of reported infections in China, Italy and the United States have been in people under 18 years old.