There, it is believed that mammary gland receptors interpret the «baby spit backwash» for bacteria and viruses and, if they detect something amiss (i.e., the baby is sick or fighting off an infection), Mom's body will actually change the milk's immunological composition, tailoring it to the baby's particular pathogens by producing customized antibodies. (parents.com)
Infections, parasites, toxins, foreign objects among other causes can lead to similar symptoms; a test of the faeces to look for particular pathogen would be useful along with sensitivity testing. (wagwalking.com)
(T cells and B cells are the two main weapons of the adaptive immune response, which enables the body to build long - lasting immunity against a particular pathogen.) (sciencenews.org)