The nutritional qualities of breast milk change over time to meet the baby, so older breast milk may not be as nutritious for your young one. (omaby.com)
Not only does the amount of breast milk change as your baby grows, but the amounts of the nutrients and immune factors change, too. (verywellfamily.com)
Plus, breast milk changes throughout a feeding, from day to day, and over time — something that can't be copied and manufactured in a lab. (verywellfamily.com)