You can consult a speech therapist if you are very anxious about your child's speech or if the child is really having difficulty in talking i.e. becomes breathless while talking, shows undue amount of tension in his speech muscles or has decreased in his speech output (ie. the child starts speaking less). More tips here: [https://www.pediatriconcall.com/articles/ent/stammering/stammering-patient-education#1568](https://www.pediatriconcall.com/articles/ent/stammering/stammering-patient-education#1568)