"One reason the authors suggest as explaining the lack of difference in gut bacteria between each group at 6 months is the potential protection the children received from breastfeeding, which continued in most children through 6 months. They [Lotta Nylund et al.] noted, 'Thus, it seems that breast-feeding could have evened up the microbiota differences between the healthy and eczematous children and masked the eczema-associated changes, which came apparent at 18 months of age after withdrawal of breast-milk.' Had the children been breastfed longer than 6 months, perhaps they would have received further benefits."
Gut Bacteria and Childhood Eczema | Brenda Watson's Community