Mommies, who has experience with iron deficiency in children?

Mommies, who has experience with iron deficiency in children? What did they raise? We were prescribed Totem. One ampoule of juice per glass. From this glass we give one teaspoon to the child. There is no result for two weeks, but the teeth have started to color ? Can it be returned to its natural color, clean it up? The ferritin analysis showed that there is very little of it. Therefore, iron will need to be taken. I read on the internet that Maltofer is best at raising it. Did you take such a drug?