No future Astros, only former Astros with birthdays today ~
OF Brian Bogusevic (29)
Drafted in the first round out of Tulane in 2008 as a LHP, Bogusevic converted to the outfield in mid-2008. In 252 games played for the Astros from 2010 to 2012, he hit .227/.310/.346. On August 16, 2011, Bogusevic became the 26th player in MLB history to hit an Ultimate Grand Slam with a pinch-hit walk-off home run, winning the game by one run. Bogusevic signed with the Cubs as a free agent back in November.
SS Rafael Ramirez (55)
Ramirez came to Houston as a free agent in January 1992 and played in 612 games for Houston from 1988 to 1992, hitting .257/.290/.335. He was an All-Star in 1984 for Atlanta.
1B John Mayberry (64)
A first round pick by the Astros in 1967, Mayberry played in 105 games for Houston from 1968 to 1971, hitting .191/.284/.342. Mayberry went on to have a 15-year major league career in which he was an All-Star for Kansas City in 1973 and 1974.
RHP Rocky Childress (51)
Originally drafted by the Phillies in the 21st round in 1980, Childress was purchased by Houston from Philadelphia in November 1986. In 43 appearances for the Astros in 1987 and 1988, he had a 4.02 ERA and a 1.381 WHIP.