Art. 18 UN-CRC

Art. 18 UN-CRC (UN Convention on the Rights of the Child) reads (highlighting in the legal text by IntactiWiki):

UN Convention on the Rights of the Child: Part 1
Art. 18 - Responsibility for the best interests of the child

(1) States Parties shall use their best efforts to ensure recognition of the principle that both parents have common responsibilities for the upbringing and development of the child. Parents or, as the case may be, legal guardians, have the primary responsibility for the upbringing and development of the child. The best interests of the child will be their basic concern.

(2) For the purpose of guaranteeing and promoting the rights set forth in the present Convention, States Parties shall render appropriate assistance to parents and legal guardians in the performance of their child-rearing responsibilities and shall ensure the development of institutions, facilities and services for the care of children.

(3) States Parties shall take all appropriate measures to ensure that children of working parents have the right to benefit from child-care services and facilities for which they are eligible.

IntactiWiki's non-binding comment:

(1) It cannot and must not be in the best interests of the child to permanently damage their healthy genitals, even if, for example, religious circumcision advocates keep arguing that way.