As is normal with all manufactured products, the Perfect Prep® Machine dispensed water volume has an allowed tolerance of +/- 5%. Additionally, there are potential tolerances in the measurement graduations of our Closer to Nature, Natural Start® and Advanced Anti-Colic baby bottles.
This means that any volume below 100 ml may vary by +/- 5 ml, and any volume above 100 ml may vary by +/- 5%.
It’s therefore possible for the combination of both tolerances, machine, and bottle, to make the volume dispensed by the machine appear inaccurate.
Our Closer to Nature, Natural Start® and Advanced Anti-Colic baby bottles all meet or surpass the requirements for volume tolerances as specified by European Standard EN 14350.
Although we do not manufacture formula powder, we have looked at what the leading brands recommend and most assume that a 9lb+ baby will be on 4oz feeds. It is difficult to recommend a "suitable from" age because every newborn’s weight is different. Some babies are onto 4oz feeds within a couple of weeks, whereas others may take longer.