Science disagrees with you. >Impact of genetics According to the latest research in genetics, hereditary stuttering can occur in several generations in a family. In this case, congenital stuttering is observed in cases where the child's speech apparatus is weakened due to inherited genetic factors. Usually, the first signs of stuttering appear in early childhood (up to 5 years), when the process of formation of speech skills occurs. If you take timely measures to normalize speech, then the child can completely get rid of speech defects. However, in adolescence, it is still possible to exacerbate stuttering in the event of uncomfortable circumstances - stressful conditions, mental trauma, family problems. Scientists and members of the American Speech-Language-Hearing Association believe that many stutterers inherit certain traits that put them at risk for developing this speech disorder. The exact nature of these traits is currently not fully understood, but they impair a person's ability to link muscle movements necessary for a smooth and free pronunciation of phrases into a single chain. https://www.news-medical.net/health/The-Genetic-Factors-in-Stuttering-Disorders.aspx