Consent of a parent may include a waiver of the right to notice of: the filing of a petition under this subtitle; and further proceedings under this subtitle. Consent to guardianship is not valid unless the consent: is given after the child for whom guardianship is sought is born; is given in a language that the party understands; if given in a language other than English: is given before a judge on the record; or is accompanied by the affidavit of a translator stating that the translation of the document of consent is accurate; contains an express notice of: the right to revoke consent, at any time within 30 days after the person signs the consent, unless the revocation is barred under subsection (b)(2) of this section; the search rights of adoptees and parents under § 5-3A-42 of this subtitle and the search rights of adoptees, parents, and siblings under Subtitle 4B of this title; and the right to file a disclosure veto under § 5-3A-42 of this subtitle; and is accompanied by an affidavit of counsel appointed under § 5-3A-07(a) of this subtitle stating that a parent who is a minor or has a disability consents knowingly and voluntarily. Subject to paragraph (2) of this subsection, a person may revoke consent to guardianship at any time within 30 days after the person signs the consent. A parent may not revoke consent for guardianship of a child if: in the preceding year, the parent has revoked consent for or filed a notice of objection to guardianship of the child; and the child is at least 30 days old and consent is given before a judge on the record. If a petitioner becomes aware, before a court rules on a petition, that a condition of consent under § 5-3A-18(b) of this subtitle cannot be fulfilled, the petitioner promptly shall: file notice with the court; give notice to all of the other parties; if consent was received from a governmental unit or person who is not a party, give notice to that unit or person; and if the unit or person enters into a new consent, file the consent with the court; or if the unit or person fails to enter into a new consent, dismiss the petition.