How to sterilize the membranes on a medela pump

Written by lynn burbeck
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How to sterilize the membranes on a medela pump
Babies can be fed breast milk directly or by using a pump. (newborn image by Valentin Mosichev from

Washing and sterilising the individual parts of a Medela breast pump is important for maintaining the cleanliness of the pump and, consequently, the safety of the milk that is pumped. Every part of the breast pump that comes into contact with the milk should be washed thoroughly after each use, including the small white Medela membranes and valves.

Skill level:

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Things you need

  • Sauce pan
  • Dish soap

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  1. 1

    Detach the membranes from the breast pump valves prior to cleaning by gently pulling the membrane from the valve.

  2. 2

    Place the membranes in a pot of boiling water for 10 minutes prior to using the breast pump for the first time. All other breast pump parts that come into contact with the milk must also be sterilised. After the initial sterilisation, the membranes can be washed in hot, soapy water after each use. There is no need to sterilise the parts daily.

  3. 3

    Snap the membranes back onto the valves after they are clean and dry. When properly attached, the membrane will lie completely flat on the valve.

Tips and warnings

  • For daily sterilisation, Medela sells Quick Clean Micro-Steam bags. After being washed, parts can be microwaved in the micro-steam bag for a few minutes. According to Medela, each bag can be used as many as 10 times before needing to be replaced.

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