Help Facebook birthdays not showing in phone calender

Please help. I got a Samsung Galaxy S 4g. Somewhere I changed something I shouldn't. Under accounts and sync, I got 2 facebook accounts. One showing contacts and one showing contacts and calender. In my calender it shows 2 facebook events, but I don't see any of facebook friends birthdays. T-Mobile does seem to have an answer to this. Except to reset phone which I did and now have to reinstall everything. Thanks in advance.​