Why is low iron beneficial in the gut of breastfed babies?

Low iron levels in the gut of breastfed infants create an environment that supports the growth of beneficial bacteria while inhibiting the proliferation of harmful bacteria. Breast milk is naturally low in iron compared to formula, which helps to establish a gut microbiome that favors beneficial bacterial species. These beneficial bacteria, such as Lactobacillus and Bifidobacterium, play a crucial role in the development of the infant's immune system and overall health by aiding in digestion, producing essential nutrients, and protecting against pathogens.

The presence of these beneficial bacteria is particularly important in infants because they help in establishing a healthy gut flora that can better resist infections and may even reduce the risk of certain diseases later in life. The selective pressure of low iron limits the growth of pathogenic organisms that require higher levels of iron to thrive, thus creating a protective barrier for the infant.

Consequently, maintaining a lower iron environment in the gut through breastfeeding can contribute positively to the early development of an infant’s immune system and gut health.