Although not a measure problem as the child grow, he/she will become slightly extrovert.....but it really becomes problematic at the time of their school admissions when they are called for interview etc...

Try to make the child independent...and let them have the chance to speak whenever they are asked something......do not reply on their behalf...and leave them alone with new people and watch them behind the curtain........ I think it is the common habit of most of the children to behave like...my girl 1 1/2 years old do the same.