A nurse is reinforcing teaching about colostrum with a new mother who is breastfeeding. The mother asks. "Why is colostrum so important for baby?" Which of the following responses should the nurse make?

"Colostrum provides vitamin K which is an essential nutrient for newborns."

"Colostrum provides many important antibodies that the newborn lacks."

"Colostrum contains iron, which is important for a newborn's brain development."

"Colostrum contains a natural diuretic that stimulates the newborn to void."