Cholostrum, often misspelled as "cholestrum," is the first form of milk produced by mammals immediately after giving birth. It is a thick, yellowish fluid rich in antibodies, proteins, and essential nutrients, providing vital immune support to newborns. This nutrient-dense substance helps protect infants against infections and promotes healthy growth and development. Typically produced in the first few days postpartum, colostrum is crucial for establishing the newborn's immune system.