My son is 1.3 yrs old. His both upper n lower lips suddenly starts shivering from 2 days n saliva also starts coming out of his mouth and he loses his balance but doest fall...and his lips from one sides moves a little sidewards making him look like he is smiling from one side ...From around 15 days only his lips use to move sideways n saliva use to come out but from 2 days his lips also started quivering...plzzz tell me what is it...I m worried...Thank you.