Hi @feh ,
Welcome to the community! 
You are using the Events app, isn’t it? Please what DHIS2 version are you using? I think you can definitely add the DoB as long as you can see it in the program stage attributes. See example from play:
Hi @feh ,
Welcome to the community!
You are using the Events app, isn’t it? Please what DHIS2 version are you using? I think you can definitely add the DoB as long as you can see it in the program stage attributes. See example from play:
