My initial thoughts were that all those different children were done to throw some ambiguity out there as to Jaheria possibly being the Bhaalspawn's love interest (since the Bhaalspawn could be a number of different races). Kinda like how
we had a 'jacc deviir' datamined at the beginning of EA that could have been bhaalspawn's kid.
.
Though obviously Larian didn't go with the stuff regarding the spoiler and any material regarding that was cut a long time ago.
In addition to the timeline issue and the stuff regarding spoiler though, both Jaheria and Minsc use masculine pronouns to refer to the Bhaalspawn in certain places. So if there intention was to create some ambiguity and allow our Bhaalspawn's to exist by making stuff like gender/race/love interests ambiguous, they did a rather messy job unfortunately.