I think the breastflow bottles are made by first years? My son uses them & we have no problem as long as theres breast milk in them. The couple times I tried formula he just wasn't having it.
i know this post is old lol but if any of you have breastfed babies who wont take a bottle and are closer to 4-6 months, alot of babies will take a sippy cup at this age rather than an artificial nipple
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