I expect my T to congratulate me when I bring it up, but I don't expect her to remember it. Honestly, there are a lot of important things about me for my T to remember - my birthday is not one of them.

I generally bring it up either casually, like "Monday was my birthday so my gran came over and I managed to talk with her for half an hour which is more than I manage most of the time" or less-than-casually "It was my birthday yesterday and that was hard for me because it only reminds me that I'm still alive".