Girls, we're on IV. The baby was born weighing 3.250. Now it's been a …

Girls, we're on IV. The baby was born weighing 3.250. Now it's been a month and 13 days, the baby weighs 4.400. The pediatrician said that she weighs more than the norm. At each feeding I give her 120 ml (4 tablespoons) and rarely does she drink all the formula. The pediatrician says 60 ml is enough for her. 120 is too much. But how can you immediately switch from 120 ml to 60 ml? The child will die of hunger ?