There is a controversial debate around this paper, which states that breastfed infants face the danger of iron deficiency if they are not supplemented with other food or pills early enough.
Early means that iron deficiency is a danger even before 6 months, which is the WHO-recommended duration of breastfeeding.
Critics of the study say that it may be supported by the food lobby, and that iron in breastmilk can be absorbed much more easily, than iron from food or supplements.
Is there more evidence, more studies?