How do I add birthdays to the birthday calendar?
The birthday calendar is managed by the iPhone OS and automatically filled with the dates-of-births of your contacts from the Contacts app. To add a new birthday to this calendar, please set the date-of-birth for the appropriate contact.
- Go to the Contacts App and select the contact to add a birthday to. Now tap "Edit".
- Scroll down and tap on "Add field"
- Scroll down and select the "Birthday" field
- Set the Birthday and tap on "Done"