Stuttering beginning to fade

Stuttering beginning to fade Hi there, My son is four and has been stuttering for a little over a year we've gone to speech therapy and we went with the approach of how to normalize it etc and he has done wonderfully. The one year anniversary of him stuttering was at the end of May and in the last month or so his stuttering has become extremely mild and non-existent on some days... There is a family history of stuttering but I'm wondering if this is normal? Is it possible that he could grow out of this? A year ago he could barely get a word out, but now it is so mild. You wouldn't even know it was a stutter unless you were really paying attention for it.