How can I hide **some** birthdays in iOS Calendar? I have entered the birthday for several of my Contacts, and these birthdays show up in Calendar. I know that I can enable or disable all birthdays by selecting or deslecting "Birthdays" from Show Calendars in the top corner of the Calendar app.  But I only want to see some of my contact's birthdays in the Calendar; for example, personal contacts but not ex-coworkers.  

How can I prevent the display of certain birthdays?
You could edit out the birthdate information from those contacts you do not want to see in the Birthdays calendar.

Another way to accomplish this would be by manually adding the birthdays you do want to see to a new or existing calendar and then disable the Birthdays subscription.