The color of breast milk could change by time phase and type of diet the mother has. You may notice that the color of your breast milk changes over time. During the first few weeks after you have your baby, your breast milk changes quickly. Not only in composition and amount, but also in color.
Colostrum: Colostrum is the first breast milk that your body makes. You only make a small amount of colostrum, but it's concentrated and highly nutritious. While colostrum is sometimes clear, thin, and watery, it's more often yellow or orange and thick. The high levels of beta-carotene in colostrum give it its dark yellow or orange color.
Transitional Milk: After the first few days of colostrum, the production of breast milk increases and your body begins to make transitional milk. During this two week transition period, the color of breast milk typically changes from yellow to white as your milk comes in.
Mature Milk: After about two weeks, your body reaches the mature milk stage. Mature breast milk changes in appearance based on how much fat it contains.
Foremilk: In general, when the mature milk begins to flow out of your breast at the beginning of a feeding or pumping session, it is thinner and lower in fat. This milk is called the foremilk. Since foremilk is thin, it tends to look clear or bluish.
Hindmilk: As you continue to pump or breastfeed, the fat content in your milk goes up. As the fat increases, breast milk turns into creamier milk called hindmilk. Hindmilk has a thicker white or yellow appearance.
Certain foods, herbs, nutritional supplements, and medications can change the color of your breast milk. Consult your doctors when unsure.
Stored Breast Milk
When you pump and store breast milk, it can change a little bit. In the refrigerator, breast milk may separate into layers. There may be a thick, white or yellow creamy layer on top, and a thinner clear or blue-tinted layer on the bottom. You don't have to worry. It's normal, and it doesn't mean the milk went bad. It's just that when it sits, the fat rises to the top. When you're ready to use it, you just have to mix the layers by gently swirling the bottle. Breast milk can also change color in the freezer. Frozen breast milk may look more yellow.