Saudis rethinking on Tribal traditions of child marriage

Re: Saudis rethinking on Tribal traditions of child marriage

^By your logic, muslims are also allowed to marry more than four.

"There should be neither harming nor reciprocating harm"

^What does it mean? And how can someone conclude from this statement that you can do nikah with a 9 years old?

Also, can a woman do nikah with an eight or seven or six years old boy?