Add Comment Question: I am on sick leave and my employer is stating I must go on mat leave on the predicted date of birth by my OB? They state this is in the standards employment act. I can’t find such information. Answer: Thank you for your question. You leave can start on the actual day the baby is born. It does not have to be the due date. See here: https://www.ontario.ca/document/your-guide-employment-standards-act/pregnancy-and-parental-leave#section-1 Your Comment * Your Email * Your Name * Your City Note, your name, city and email is not displayed on the website. It is used to notify you that we have approved your comment.