It contains protective substances that give her immunity to diseases. (healthybabycode.com)
What's more, it has been discovered that this brain protective substance actually serves as the precursor for such brain supportive chemicals as vitamin D, estrogen, progesterone, and testosterone. (mindbodygreen.com)
Another class of protective substances found in breast milk are polyunsaturated fatty acids and nondigestible oligosaccharides. (journals.lww.com)