When does a baby go to preschool?

The age a baby goes to preschool varies greatly depending on the country, state/province, and even the individual preschool program. There's no single answer.

However, most preschool programs accept children starting around age two or three. Some may accept children as young as 18 months, while others only begin accepting children at age four (which is sometimes considered pre-kindergarten instead of preschool).