When does ensoulment begin? I have read or been told that a soul reincarnates into a new being at conception, or quickening, or at first breath out of the womb. Does culture or situation account for the different beliefs?

I know you have said that with the population growing rapidly, souls now reincarnate sooner than they would have with a lesser population. Is/was there a typical length of time for humans? How about animals, especially dogs or cats, in other words, household pets?

Thank you for your reply.