1. Contact the local government department: you can apply to the local people's armed forces department or relevant government departments to obtain the information of the children's four good soldiers' certificates.
2. Consult local military institutions: You can contact local military institutions, such as the armed forces department and the military sub-division, and ask them about the situation that Child Four has a good military certificate.
3. Online inquiry: You can search the relevant government websites or military websites to see if there is an open soldier information inquiry system, so as to inquire about children's good soldier ID information.
Please note that inquiring about this kind of information may need to meet certain conditions or be audited, so you may need to provide some supporting documents or identification.