I was advised (by a specialist, not a lawyer) not to include my Canadian born daughter on any forms other than on IM5406 Additional Family Information form. CIC sent me an e-mail asking for a copy of her birth certificate which I sent and that was that. The child doesn't need to appear anywhere else since they do not require PR status to remain in Canada. You might want to send a copy of the birth certificate with the application just so they have it and don't need to ask later.