HI, I HAVE 11 MONTH OF BABY SON. HE IS

HI,
I HAVE 11 MONTH OF BABY SON. HE IS VERY WEAK, HIS IMMUNITY SYSTEM IS NOT GUD AS HE DONT TOOK MOTHER'S FEED. HE WAS ADMITTED EVERY AFTER 2 MONTHS ,REASON IS DEHYDRATION N GREEN STOOL. PLEASE TELL ME WHAT IS THE REASON OF DIA AS HE IS TAKING MEALS NW AND WE ALSO DROP BOTTLES FEED. HE IS TAKING MEALS FROM STERILIZER BOWL N SPOON. AND TAKR MILK FROM BOILED GLASS. PLEASE TELL ME AND ADVICE ME.