Or how many of them there may be? Potentially more than zero, certainly fewer than the (large) number of births today, and the argument is that one pronoun is

Or how many of them there may be? Potentially more than zero, certainly fewer than the (large) number of births today, and the argument is that one pronoun is (in)accurate for an individual...what we need here is “they” because there will as likely be a group of “them” as one alone.