CD79A and digestive system infectious disorder: Immune support by bovine immunoglobulins as an alternative for breast milk-derived IgA is especially relevant in the period just after birth in case the mother cannot breastfeed her child and is dependent on bottle feeding, but also in the weaning period at around 4–6 months when respiratory and gastrointestinal infections are known to increase as the passively acquired maternal IgG in serum, as well as the maternal breast milk-derived IgA in the gastrointestinal tract of the infant, have decreased to very low levels.