Hi Rene,
Thank you for your inquiry, you can use the Medela Milk Collection Shells for milk collection in-between feeds however, we would suggest collecting it every hour. We hope this helps. if you follow the link https://www.babyonthemove.co.nz/store-locations/ this will take you to our online store finder. Here you can find contact details for your nearest Baby On The Move Store where one of our team experts will be happy to assist you in your product search and help answer any further questions you may have.
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