The Mexican Constitution itself says that any child of a Mexican parent is of Mexican nationality and citizenship, REGARDLESS of nation of birth. Chapter II, Article 30, paragraph II
https://www.oas.org/juridico/mla/en/mex/en_mex-int-text-const.pdf
The anchor baby business is nonsense and in violation of Mexican law.
Go read it.
I believe you. This business of foreign nationals having their children granted automatic U.S. citizenship just because they drop the baby on our soil must be brought to an end, it is a perversion of the 14th Amendment.