Thanks for the heads up on this Aria. Yeah, BlueJay, adding Sims to the household in Wishmasters is forbidden. Did that happen, or did your Sim get another Sim pregnant and that Sim had a baby outside the house? If that's what happened then that's okay.
Just like last time with Patrick, now Chad got a baby (actually two) at his fiancee's house. Don't fret; I know the rules.
As long as the mother is not in the household, the baby doesn't get added to the household, so it's all good.
His second baby, although he didn't go to the hospital (he didn't even meet the baby, or see his fiancee when she was pregnant), produced the same effect: +80 moodlet with "It's a Boy!" I guess hospitalization doesn't necessarily mean he gets the moodlet then; EA wants people to be happy to get babies. In Sims 2 there were fears for getting married and having children. Where did that go?