ANSWER:

This is not permissible. He fasted on a Monday for a number of reasons which among them were that he was born in it and was revealed to and made a messenger in it. What are your reasons for fasting and why didn’t any of the companions ever fast on their birthdays?

As Prophet Muhammad salallahu alahi wa sallam fasted on his birthday so should we also first on our birthday or will it be a form of celebrating birthdays?