What Should Be The Causes For The Death Of Baby?

Hi ,i am radhika my baby was born on october 6th ,he was fine upto one month .after one month he was affected with womting and motions sometimes.womiting is coming from mouth and nose also,he was having continues check up from the doctor he was just writing some medicines .when he was born his weight is 2.9 kgs but after somedays weight fall back to 2.5 kgs and there is no incrase in weight till 46th day .on 46thday he was having 10 loose tools ,for that i took him to doctor there they injected some medicines after that there was decrease in pulse and bp rate and respiration problem ,he was given ventilator support .he was tested then they said that he was attacked with cardic bravia and crp is positive .i dint understand his problem .he was no more on 47th day .please give me information about his death .in preganacy i was having albumin+1 and uninary infection .will thease be causes for my child death .