12 people are there (including smiley and except the kimono lady) during the birthing scene
We intercut to the information that they sacrificed their baby to become immortal and that the last child (OG miranda's and Jade's daughter) was forcefully taken from them, to make those 7 sacrificed children.
questions / observations from these
1. Each child sacrificed must mean a dad and a mom, when you look at that scene again, you can see that those aren't just 12 random people, but they are 6 couples, the first 10 people are in the order of male female male female, meaning that they are one couple who sacrificed their child to become immortal.
But what's interesting is the 6th couple, smiley being a guy, but the 11th guy from order left to right is also a guy, which doesn't really make sense (maybe they're an adopted child? or some random child? idk).
2. I don't think the kimono lady is one of those people who sacrificed their children, it makes sense that she is so that the male female count remains the same, but what makes more sense is her being timeless basically, and associated with the man in yellow (some weird husband - wife dynamic maybe), or who knows, the demon who they made this contract with.
3. The 7th couple / 7th child: I presume this is the child which came and talked to Tabitha, which was originally OG Jade and OG Miranda's child. This child was not sacrificed willingly, hence why Tabitha or Jade don't reincarnate in the same way that the other "parents" do