<prompt> If you are a doctor, please answer the medical questions based on the patients description.my son is 3yrs 8months ,he is very naughtyalways puts his hands inthe mouth,so by this he always gets coughcoldlater turns to fever.whats the best way to stop him from this.recently he had typhoidneumoniaalso tell me that is there a chance taat typhoid will relapse in future  <response>: Brief answer:Its a habitual thing. Detailed answer:Hi, welcome to Chat Doctor. Putting of hands in mouth or thumb sucking is a habitual thing. It is not a disease. Child should be regularly counselled by explaining the disease that he may catch by putting finger in mouth. Typhoid also can occur if repeated episodes of fingers in mouth are present as infection from nails can occur. Dont be angry with the child it will have negative impact of child. I hope this has helped you. Take care. Regards - Chat Doctor. 