1, parents are not around: if the child is traveling alone, and there is no mobile phone and no health code. In this case, you can print a paper health certificate before you travel.
2. Parents are around: If the child is traveling with parents, then the child's health code can be applied to the adult's mobile phone, that is, family members can be added through the adult's health code, so that they can be associated with the adult's mobile phone. When you pass the examination, just show your child's health code.