Do children also need to obtain a certificate of testing for Japan Travel?

Japan request that children also obtain a certificate.
However, in consideration of the fact that many countries do not test preschool-aged children
as part of their system, children (generally under the age of 6) do not need to have a certificate,
as long as they are accompanied by caregivers, including parents who obtain negative testing
certificates.

Information obtained from: Ministry of Foreign Affairs of Japan Website

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