Maryland Code, Family Law § 2-301

(1)(i) the individual has the consent of each living parent, guardian, or legal custodian of the individual; or

(ii) if the individual does not have the consent required under item (i) of this item, either party to be married gives the clerk a certificate from a licensed physician, licensed physician assistant, or certified nurse practitioner stating that the physician, physician assistant, or nurse practitioner has examined the woman to be married and has found that she is pregnant or has given birth to a child; and