Ladies, copy and paste from some articles (hope it helps)
One important fact of using glass bottle:
Don't use glass bottles if you are going to store the milk for less than 24 hours, because some of the white blood cells will adhere to the glass, but not to plastic. But the white blood cells will detach after 24 hours (although not 100%).
However, glass bottles or containers are best for freezing breast milk because it offers the most protection from contamination. The second choice is clear, hard plastic, and the last choice is the cloudy hard plastic containers.
One important fact of using glass bottle:
Don't use glass bottles if you are going to store the milk for less than 24 hours, because some of the white blood cells will adhere to the glass, but not to plastic. But the white blood cells will detach after 24 hours (although not 100%).
However, glass bottles or containers are best for freezing breast milk because it offers the most protection from contamination. The second choice is clear, hard plastic, and the last choice is the cloudy hard plastic containers.