The protective effects of breast milk are known to be associated with:
d. IgA antibodies(Ref: Nelson's 20/e p 286-290, Ghai 8/e p 150-161)Although antibodies & lysozyme, both are important for protective effects of breast milk, antibodies (IgA) play a major role.
IgM antibodies
Lysozyme
Mast cells
IgA antibodies
Nutrition