It's been my experience with the babies that have used the breastflow bottle that they tend to bite and compress more while nursing.  Don't they have to bite/compress that blue thing inside to get the milk?  Also some sippy cups require the same compression to open the slits that are vertical.  Not something I choose to use.  

Just my 2 cents

Maria Parlapiano RN IBCLC (my 3rd post today - now gotta work)
Chatham, NJ

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