Registration for Spring 2014 Southside Little League tee-ball, softball, and baseball programs (from 11am to 2pm) for boys and girls ages 4-12 who live or attend school in the Southside region (City areas east of the Genesee River and south of East Avenue). A Chartered member of Little League since 1954, Southside Little League is a youth sports organization that emphasizes fundamentals, fitness, friends, family, and fun.