Changing name in settings

Dana ☀️ • 32. Married 7.12.13 • Mommy to Elliott 👧🏼 3.5.16. Due with baby girl #2 12.12.18
Does anyone know how to change the baby's name in the settings?  Now that I know what we are having I want to change it to her name.  I have tried to figure it out myself,  but can't.