I am staying Kolkata with my husband and daughter. I got email Id from doctorskerala website.I have a 6 months old daughter.She was born in kolkata.She is very active and healthy.From the 4 month we have noticed that she is shaking her head like a tremor or shiver of chillness in one word it can be said as Shudder . Her head and shoulder shakes. This occurs for a second only.In a day it happens 6 to 7 times.Here in Kolkata I consulted the Doctor, he said it is normal. But now while shaking she is making a sound also.This does not happen when she is sleeping.Her activities are very normal. Now she has turned over and trying to crawl forward and responds and smiles to us whenever we call her. We are very much worried with her head shiver. Sir, kindly tell us what & why is this happening so that we can take steps to treatment.