 [ Symptoms ] i have or think i have cystic fibrosis when should i contact my doctor [ Disease ] there is not set amount the amount of local anesthesia lidocaine that is used depends on the location of the injury you did not say where the injury was located the depth of the laceration i am assuming this was a cut   you did not say and the skill of the clinician some people use more and inject it in a wide area some use less and only inject it where the sutures will be placed some children scream even if they do not feel a thing since they are absolutely frightened but it is possible for him to feel something if not enough time elapsed to allow the anesthesia to take effect only a few minutes without knowing the details this is the best i can do to answer your question