Colostrum

The milk secreted by the mother after 2-3 days is called colostrum. Colostrum has thick components, small amount, slightly yellow, and contains particularly many antibodies. Human milk contains IgG, IgA, and IgM. The highest concentration is in colostrum (milk within 2 to 4 days after delivery), of which secretory IgA (S IgA) is the highest in all exocrine fluids, with the prolonged lactation period, the levels of IgG and IgM decrease significantly. The content of S IgA in mature milk (milk from 2 to 9 months postpartum) has also decreased significantly, but the total amount of S IgA intake by infants has not decreased significantly due to the increased milk production of mature milk. In addition, human milk still contains a variety of antibodies, the main component is IgA. These antibodies are distributed on the pharyngeal, nasopharyngeal, and local gastrointestinal tract mucosal surfaces of infants to neutralize toxins and agglutinate pathogens to prevent infiltration into the body.

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