Is there canon on exactly when a person's daemon takes an actual form?

There is literally nothing on how daemons are born. There's a lot of headcanon I've seen, but nothing official. My own thought is that the daemon takes a baby version of the form of the first animal it sees, usually the mother's, and stays that way until the baby starts to become self-aware. I've seen a theory that daemons are just golden blobs until the baby becomes self-aware, and then it takes on a form. But that's from the daemon religion people, who are a bit..unique. I suppose that could work for blind people--their daemons just never become animals, and remain more shapes or blobs; those with more vision looking more like animals than those who have less vision. Being totally, completely blind isn't as common as it's portrayed. Legally blind people can still see somewhat a lot of the time.

I'd imagine a deaf person would settle into a daemon with fingers. Unless they also communicate by the daemon writing/scratching out words?

Or some sort of code they inventing themselves, using wing positions, or nose tapping on the human's hand or tail swishes or something.