Does a 2-year-old child need to bring identification documents or is it okay as long as there are more adults at the door?

Children aged 3 years old and below, whose height is 1.0 meter or below, are exempt from ticket fees. According to the official Weibo of “Shanghai Disney Resort” displaying children’s ticket standards, starting October 8th, 2019, children tickets will consider both age and height requirements, that is, meeting either one criterion suffices.
Children under 3 years old and below 1.0 meters tall can be exempt from ticket fees. According to “Shanghai Disney Resort” official WeChat about children’s ticket standards, as of October 8th, 2019, child tickets will consider both age and height, i.e., either satisfying the age or height criteria is acceptable.