Thank you! I received the request for the following documents -
1. A new Generic Application Form for Canada (IMM 0008) with supporting documents
2. A completed Additional Dependents/Declaration form (IMM 0008DEP)
3. (If applicable) A Schedule A - Background/Declaration (IMM 5669) form,
4. (If applicable) A signed Additional Family Information (IMM 5406) form,
5. A copy of the birth certificate, marriage certificate or proof of common-law relationship,
6. A copy of the family member's valid passport,
7. Police certificates for all countries where the family member over the age of 18 has lived for more than 6 months since turning 18,
8. A letter of explanation, and
9. If applicable, the proof of payment.
You can also follow this thread for more information -
https://www.canadavisa.com/canada-immigration-discussion-board/threads/addition-of-new-born-express-entry-aor-received-fsw.742232/page-8#post-10001317
All the very best