For sponsoring person for Bangladesh it says
IDENTITY AND CIVIL STATUS DOCUMENTS (Principal Applicant - your spouse)
• Provide birth certificates, baptismal certificates or other official document confirming relationship (including all pages of Household Registries) for you and each of your family members.
• If you are married, you must include a marriage certificate. If you are divorced, you must include final divorce certificates; if separated, a separation certificate. If your former spouse or commonlaw partner is deceased, you must include your spouse’s or partner’s death certificate.
• Further clarification regarding the above-mentioned documents is given below for nationals of Pakistan, Korea and Taiwan.
• Photocopy of Citizenship Certificate, Permanent Resident Card, Permanent Resident Visa or Immigrant Visa for family members who are Canadian citizens or permanent residents of Canada.
• If you are in a common-law or conjugal relationship, provide proof of that relationship
So yes birth certificate and marriage certificate are required