They have identified genes (FOX P-2 and GNPTG) that are very likely candidates for influencing speech development, so as of today the scientific community accepts the idea that stuttering does have a genetic basis. But there’s no way to predict if a child will have a stutter or not until they physically begin to speak. Here’s an article that goes more into depth on the relationships between genes and speech disorders https://www.annualreviews.org/doi/full/10.1146/annurev-genom-090810-183119?url_ver=Z39.88-2003&rfr_id=ori%3Arid%3Acrossref.org&rfr_dat=cr_pub%3Dpubmed Hope this helps! :)