I will look into that Laura... GREAT idea!
For now we do have the Calender feature above , on the main bar.
You will also be able to see the avatar by scrolling on the persons name.
Than on the calender that is placed on the left lower section will also highlight
how many people have bithdays on that particular day.
So right now it is showing 1 birthday on the 18th...if you click on it it will show u who :' )
I hope this makes sense.