I’ve just measured a bottle using the mam bottle measurements at 180ml, then poured into rapid cool and it was well under 180ml in the rapid cool. I’ve started stirring with a sterilised spoon rather than shaking and hadn’t noticed the difference in measurements until now because of the foam that shaking creates. Husband makes bottles using the rapid cool measurements, I use the Mam bottle measurement, which one is right? Or have I gone mad and actually measured 150 accidentally? 🙈
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it could be a different measurement once you pour in the nuby due to the difference in width?

I think the nuby is a bit off tbh! Always seemed weird to me! You could use a measuring jug to test the measurements of both and see which one is correct?

I find the nuby really hard to read inside as it steams up etc. I always just measure out in the mam bottle first and pour in then know it's right