Upvote:3
AeroMexico says the following for accompanied children between the age of 2 and 16:
Children traveling with parents, guardians or third parties If a Mexican or a foreign national child, who is a permanent, temporary, or a temporary resident student in Mexican territory, flies accompanied by their parents, guardians, or third parties, the minor must produce one of the documents below:
On domestic flights:
Birth certificate
Current passport
Current school photo ID card
Unique Population Registration Number (CURP)
International flights are more complicated.