If birthdaydate is a date type column (which it should be, but from your example data does not appear to be):
SELECT * FROM `table` WHERE MONTH(CURDATE()) = MONTH(`birthdaydate`)
If birthdaydate is a character field of some sort:
SELECT * FROM `table` WHERE MONTH(CURDATE()) = MONTH(STR_TO_DATE(`birthdaydate`, '%d-%m-%Y'))