DONE - What is that white stuff that sticks to the sides of the bottle?

When you refrigerate your breast milk or freeze it and then let it thaw back out, you'll notice a white residue that often sticks to the sides of your bottles or milk storage bag.  That's the fat in your breast milk, it's perfectly normal for breast milk to separate when cooled.

When you give the bottle to your baby, be sure to gently swirl the bottle around to mix the important fat back into the milk.  Do not vigorously shake the milk to mix it together as some research says this breaks down some of the milk proteins.