Girls, whose child was gaining weight poorly on IV? We were born on 3.…

Girls, whose child was gaining weight poorly on IV? We were born on 3.040 now weigh 4200 we weigh 2 months old. They said to drink Elkar. Who drank, is it worth it? I don't know what to do anymore, he eats poorly, feeds 40-90 ml of mixture, although he should already eat 150. The mixture has been changed 2 times already and eats like this.