While Rob had been vocal in the past about his desire for a baby boy, he told the Rob & Chyna cameras he's going to be "super happy with a girl."
"It's an emotional moment," Rob said. "Me wanting to have a boy, it definitely stems from my dad, but I'm sure I'll have the same relationship that I had with my father with my daughter. I'm just happy that the baby's healthy."
Hear more updates from Rob and Chyna in the video below.