Quarter Birthday 

A party that is held for a person exactly three months to the day after someones birthday. Because its one quarter of a year since there Birthday.

He was born on April 5th, so his quarter Birthday will be on July 5th.

Its his Quarter Birthday.

Quarter Birthday by judge dredd7 October 11, 2012

Three Quarter birthday 

A party held for someone nine months to the day after there birthday because it has been three quarters of a year since there birthday.

He was born on June 12th so his three quarter birthday will be on March 12th.

Its his three Quarter birthday.

Three Quarter birthday by judge dredd7 October 12, 2012