This is an example of what is developing inside the mouth of a typical 6 year-old child. The permanent (adult) first molars are just starting to erupt, as are the front teeth on the lower arch. The crowns of the permanent teeth are formed but the roots of the teeth have not yet developed. The spacing you see in the photograph is normal. This spacing of the primary (baby) teeth allows room for the larger adult teeth to erupt into place.