What Treatment Is Suggested For Jaundice?

MY SON IS 7 MONTHS BORN JAUNDICE,IT WAS DISCOVERED AFTER 4 DAYS AND IT WAS VERY HIGH,HE WAS PUT ON LIGHT BUT IT DID NOT DROP INSTEAD IT GOES UP,BUT AFTER 2 WEEKS HE WAS DISCHARGED BUT THE DOCTOR SAID HE IS ALREADY INFECTED. AFTER 3 MONTHS HE GOT SICK AGAIN AND WAS HOSPITALISED AND HAD THE FOLLOWING SIGNS:HIGH PITCH CRY,PULLING HEAD BACKWARD,SEVERE CONSTIPATION.AT 4 MONTHS THE MUSCLES AND THE NECK BECOME WEEK AND I STARTED PHYSIOTHERAPY BUT STILL HE HAS NOT START SITTING. MY QUESTION IS HOW LONG WILL HE START TO LEARN HOW TO SIT AND THE NECK TO GET CONTROL.MY HR FACTOR IS NEGATIVE