Breastmilk Bottle Single - 5 oz. FAQs

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  • Can bottle liners be used with Medela breastmilk bottles?
    • Medela does not suggest the use of bottle liners as anything placed into the bottle can interfere with the valve assembly causing lack of suction.  If you wish to use a bottle liner, pump into Medela bottles and then pour the collected breastmilk into the bottle liner.


  • What are the breastmilk bottles made out of?
    • Medela breastmilk bottles are made of FDA food contact grade polypropylene.  Medela bottles are BPA-Free and designed for safe feeding and long-term storage of breastmilk.

      Polypropylene has a recycle number of 5 or PP stamped into the plastic item.  Medela only uses new, virgin materials in manufacturing of all products.

Misc. Questions & Answers

  • What are the ages for the slow and medium flow nipples?
    • Each silicone nipple is stamped with an “S” for Slow-flow or an “M” for Medium-flow. 

      Wide base slow flow 0-4 months.

      Wide base medium flow 4-12 months.

  • How do I store my breastmilk?
      • It is normal for pumped milk to vary in color and consistency depending on your diet. Stored milk will separate into layers and the cream will rise to the top. Gently swirl (don’t shake) the bottle to mix the milk layers.
      • Avoid adding freshly pumped milk to already cooled milk.  You can add small amounts of cooled breastmilk to the same refrigerated container throughout the day.
      • Pumped milk may be added to frozen milk provided it is first chilled and the quantity is less than what is frozen.
      • Store your milk in Medela’s BPA-free breastmilk collection bottles or in storage bags specifically designed for breastmilk, such as Medela’s BPA-free Pump & Save™ bags.
      • Freeze milk in two (2) to four (4) ounce portions. Small amounts thaw more quickly. You will waste less milk this way. Be sure to leave some extra room at the top of the container so the bottle or bag will not overflow when freezing or thawing.
      • Seal containers tightly. Write the date on a piece of tape and place on the bag or bottle. Use the oldest milk first.
      • If you do not plan to use the milk within a few days, freeze it right away in the coldest section of your freezer. 

        Breastmilk Storage Guidelines