My girlfriend and I have only known each other for half a year and have been dating for a month. My girlfriend asked me if it was appropriate for us to say that her birthday was her mother.

Second, make sure that you can really be together, no matter what obstacles you encounter.

Third, discuss with your girlfriend whether you want to be together, and don't fall out even if you don't have the same personality.

Fourth, make sure you really love your girlfriend.