What does it mean to have a baby?

What does the fortune teller mean by twins?

"Twins" means having two sons in succession, not twins. Chapter 36 of Ancient and Modern Wonders, Liu's twin son, tells the story that this man has no children. Because of his kindness, although he was old, he took a maid as his concubine, gave birth to two sons in succession, and became a great official with incense, which became a beautiful talk.