If you click on the bottom line (about pregnancy) in the statistics window of a character marked with the “P” icon, a hint will appear and the opportunity to change the timing. If you don't want to change anything, just don't enter any numbers and press Enter.Thx! I found out that it's Ruby giving birth to Cassie. BTW, who gives birth to Izzy?
Regarding the question of “who has who”, the game uses “pseudo-random” selection (according to the principle “who gets up first, gets the slippers”, except for Wanda and Moose, whose mother is Yvette). It worked out for me, for example Cassie - Jean, that’s why I wrote it like that. I don’t know who will have Izzy either, experiment
P.S. Oh yes, not all characters with "P" can have children, only human...