In the study carried out by Gopalakrishna et al. (2019) maternal milk was the predominant source of IgA in the gut in the first month of life, and a decrease in IgA-bound bacteria was attributed to the development of NEC, and Enterobacteriaceae was dominated in the IgA-unbound fraction of the bacteria before the onset of NEC. Here, CD79A is linked to necrotizing enterocolitis.