Women's Health

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Do not:

• Refreeze thawed milk.
• Use thawed (and then refrigerated) breast milk after 24 hours.
• Use a microwave oven for warming milk. Microwaves heat unevenly, creating hot spots that can burn your baby's mouth and throat.

There is very little research about how safe it is to refrigerate and reuse breast milk left over from a previous feeding. But many experts say it is best to throw away any breast milk left in the bottle after a feeding.

Some people are concerned about bisphenol A (BPA), a chemical in some plastic (polycarbonate) bottles. A group of experts concluded that BPA may have some effect on the behavior, brain, and prostate gland of a developing baby (fetus) or young child.³ If you are concerned about BPA, don't use bottles marked with the number 7 or the letters "PC" near the recycle symbol. You can use glass or BPA-free plastic bottles instead. For more information about BPA, see the website www.hhs.gov/safety/bpa.