VISA FOR MY KID

HEY GUYS!!
RAMADAN KAREEM!!
I'VE GOT ONE QUESTION HERE. I AM LIVING WITH MY WIFE IN QATAR WE BOTH WORKING.NOW WE ARE PLANNING TO BRING OUR SON UNDER FATHERS SPONSORSHIP. HE IS 1YEAR AND 9 MONTH OLD.WHAT ARE THE EXACT DOCUMENTS REQUIRED ?HOW LONG WILL IT TAKE AND HOW MUCH?
IS IT EASY ONE?
KINDLY AWAIT YOUR REPLY..
THANX.
thank you Minda..
documents needed - marriage contract, birth certficate of the son, your qatar i.d. and try consult your company's PRO.he knows other documents.