A nurse is reinforcing teaching about colostrum with a new mother who is breastfeeding. The mother asks. "Why is colostrum so important for my 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 a natural diuretic that stimulates the newborn to void."

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