Starting in 2011 Groton Youth Baseball adopted a "50/70" field length of youth baseball field dimensions for the Major League Baseball Division.
50/70 describes the length of the pitchers mound (50 feet) to home plate and the length of the base path (70 feet). Youth baseball traditionally played with a 46 foot pitchers mound (from the mound to the plate) and 60 foot long base path. 50/70 Baseball allows for a more realistic baseball experience and offers many changes that help develop baseball and make for an exciting baseball experience. Among the changes for 50/70 over 46/60:
Real-Time Base Leading and Stealing
Pitchers will hold runners on base, learning to pitch from the stretch
More advantage to the hitter, because of the longer baseball mound to the plate
Easier transition to the larger Babe Ruth size field
Allows for players to develop real baseball skills