Spacing in the primary dentition is a great thing! The permanent teeth that follow are usually a lot larger than the baby teeth, so this gives the permanent teeth room to come in. There is always a chance there will be spacing in the permanent teeth as well, but it’s very difficult to tell this early on.
As an aside, the posterior permanent teeth tend to be slightly smaller in dimension....
Sometimes, people have a strong flap of skin connecting the upper lip to between the front teeth called a "frenum" or "frenulum." If this flap is too thick or strong, it will keep a gap or "diastema" open on the front teeth. This is the most common way to have spacing on the permanent teeth and sometimes requires a minor surgery to be removed.
Marc D. Thomas, DDS