Why are the measurements on my Dr. Brown’s bottle different than other measuring cups and bottles?

Differences in every liquid measuring device occur depending on how each manufacturer applies the measurements, which can be printed on or engraved on the measuring device. There are standard expected variations between measuring devices made by different manufacturers. Here are the variations so you can determine the difference between your own measuring devices:

The difference between measuring devices

If your baby bottle or drinking cup is marked with numbered graduations, here is the expected variation between them and your Dr. Brown’s bottle:

  • If the bottle or drinking cup is greater than 100 ml, the difference will be +/- 5 percent. This means that one bottle will measure at 250 ml (8 oz), and another baby bottle may measure at as little as 237.5 ml or as much as 262.5 ml.
  • If the bottle or drinking cup is less than 100 ml, the difference will be +/- 5 ml. This means that one bottle will measure at 120 ml (4 oz), and another baby bottle may measure at as little as 115 ml or as much as 125 ml.

For help determining your measurement variations, please reach out to our customer service team.

The Dr. Brown’s Measuring Calculation Process

Dr. Brown’s bottles have been tested per the EN14350 standards for volumetric testing. Here is how we determine placement for the measurements on our bottles:

  • We pre-condition the bottle to reduce the shrinkage before we start the liquid measurement calculations to ensure better accuracy.
  • Water is used for all calibration measurements and we measure all water amounts with a laboratory graduated cylinder, again for accuracy.
  • The water is then poured into the bottle and the height of the water is recorded using a digital micrometer for more precise recordings.
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