The advantages of switch hitting are well-documented. When facing a pitcher throwing with the opposite-handedness of the batter, the batter has better visualization of the pitch's release point, and can begin to track the pitch sooner. The pitcher's breaking balls break toward the hitter's bat, rather than away.
When should I start switching hitting?
A player can be any age to begin switch hitting, although it is easier to learn when they are young (5-7 yo). Switch hitting should be the players choice and it should be fun. The key to becoming a good switch hitter is to get a lot of quality swings from both sides of the plate.
What percentage of MLB players are switch hitters?
So, about 8% of players on Major League teams are switch hitters. If you look at position players only, then 13% are switch hitters, 54% right-handed and 33% left-handed hitters.