He has previously said that he's never wanted to be a parent, but apparently, this woman, his friend's estranged wife, changed his mind. Or it was changed for him, we'll never know.
Still, I think it's good for someone as selfish as Simon to have a child. I don't think there's any way they can see they're that selfish until someone comes before them. I only hope this baby is going to do it for him. He's a perfectionist, so hopefully, he'll try to do that well too.
I think we can see by their pictures what they have in common: