N.M. Stat. § 40-11A-612
Child as party; representation.
A. A minor child is a permissible party, but is not a necessary party to a proceeding
pursuant to this article.
B. The district court shall appoint a guardian ad litem to represent a minor or
incapacitated child if the child is a party or the district court finds that the interests of the
child are not adequately represented.