Colostrum protects a newborn because it is rich in which antibody class?

1. Colostrum is the yellowish fluid secreted by the mother during the first days of lactation. 2. It has abundant antibodies of the IgA class. 3. Those antibodies are ready made, so the infant gains passive immunity from them. 4. A newborn cannot yet mount a full active response, which is why this matters clinically. 5. This is the single strongest argument for early breastfeeding taught here. _Source: NCERT Class 12 Biology Ch7 'Human Health and Disease', section 7.2.3_