There is a good synopsis article of a research done on the Avent vs the 
Playtex Natural Latch bottles in the most recent Journal of Human 
Lactation. Makes me glad I am a member of ILCA. I believe they did 
ultrasounds of breastfed babies drinking from either the Avent (they 
said more chewing or chomping motions) vs the Playtex (more 
breastfeeding like suck/swallow/breathe). I am sorry I am not explaining 
this well.

Kathy Eng, BSW, IBCLC

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