Colostrum is a thin, yellowish breast secretion produced by all mammalian mothers 2 - 3 days after giving birth. Colostrum is natures first food. It is high in protein, low in fat and sugar, has 10 - 17 times the iron content of milk and more A and D vitamin then milk. Antibodies are formed from immunoglobulins, which protect the new born until it's immune system is working.