Maryland Code, Labor and Employment § 3-1202

(a) Except as provided in subsection (b) of this section, an eligible employee is entitled to a total of 6 workweeks of unpaid parental leave during any 12-month period for one or more of the following:

(b) An employer may deny unpaid parental leave to an eligible employee if:

(c) If an employer provides paid leave to an eligible employee, the employer may require the eligible employee, or the eligible employee may elect, to substitute the paid leave for any part of or all of the period of parental leave.