The primary benefit of colostrum is its high antibody content, particularly immunoglobulin A (IgA). These antibodies provide passive immunity to the newborn, protecting against infections during the early days of life when the infant’s immune system is immature. This immunological protection is crucial in preventing gastrointestinal and respiratory infections. Colostrum also contains essential growth factors and leukocytes, but its main clinical value lies in the immune defense it offers. Hence, the high antibody concentration in colostrum is vital for newborn health.

Reference: Nelson Textbook of Pediatrics, Kliegman et al., 21st Edition.