Flea was born as Michael Peter Balzary, on October 16, 1962, in Melbourne, Victoria, Australia, to Mick and Patricia Balzary. Right from his childhood, Michael was called Flea due to his inability to sit still. Interestingly, the nickname stayed with him for the rest of his life. When he turned 4, his family moved to New York from Melbourne, Victoria.
The year 1972 marked the divorce of his parents after which his father moved back to Australia. After his parents parted ways, Flea and his siblings remained with their mother who went on to remarry a jazz musician.