So I heard that the universe the kids made is where caliborn is born. Even though the entire point of sburb is to make a new universe? Or is that due to time shenanigans? I would think that making a NEW universe would include new timelines as well? (Forgive me if I asked this question before)

Not quite sure what do you mean about ‘new timelines as well’? It’s just like how the Trolls created the Human Universe, the Alpha kids then created the C Universe, which is where Earth C is, and where eventually, Calliope and Caliborn will be born.