The Social Insurance Number is a 9-digit number you need to work in Canada, and have access to programs and benefits.
This link includes details for Employment Insurance (EI), temporary benefits for workers, sickness, fishing, and family-related benefits.
You can find more information about your tax return, including specific information for seniors, students, persons with disabilities, and more at this link.
EI provides Maternity and Parental benefits to individuals who are pregnant, have recently given birth, are adopting a child, or care for a newborn. For eligibility overview on Maternity and Parental benefits, click here