29. A contributor on authorized leave of absence without pay for any of the following reasons shall be required, in respect of any fraction of his absence comprised in the 52-week period following the date of the child’s birth or adoption, to pay the amount that he would have been required to pay under section 36 or 37, whichever applies to him, had he not been absent, where the employer supplies Retraite Québec with an attestation stating the reason for the leave of absence:
(1) the birth of his child;
(2) parental responsibility in respect of a child whose custody he accepted for adoption purposes;
(3) care and custody of his child.