Calender help

[rocksolid_101]

I desperately need help with this problem I have been having.
I have synced my calender on my android phone with my gmail account which has been working fine.
However the birthday calender only partially syncs meaning I am able to see some birthdays but if I go on the gmail website and check the calender, but there are some birthdays there but are not showing up on my mobile device. Does anyone have a

What I am using is samsung galaxy nexus

 

[Voliam]

In the calendar app, select <calendars> at the top, and check <contacts birthdays and events>, AND <contacts birthdays> at the bottom.

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