Congratulations
Yes, you must inform them about the birth of a child. If they ask for the document's, you could send what is available at the moment and remaining documents later.
Send an email to OttPilot-Immigration @ cic.gc.ca
In all correspondence to their office, please refer to the applicant's full name, date of birth and Unique Client Identifier (UCI) or file number.
Here are some Common Questions that may assist you:
When should you contact CIC?
You must notify Citizenship and Immigration Canada (CIC) of any changes to your application. Examples of changes include:
• Changes in your personal circumstances, such as birth or adoption of a child, death of a family member, a marriage or a divorce;
• Change of contact information (e-mail, mailing address, telephone number);
• Appointment or change of immigration representative or designated individual;
• Decision to withdraw your application.
Good luck!