Yes I know adding the powder that will increase the volume but when I use the rapid cool it comes up perfectly to or just over 4oz. When I use the prep machine 4oz feed goes right up into the neck of the bottle? Does the prep machine actually add more water than it’s supposed to?🫠 I don’t remember this being an issue with my son but I had an earlier model of machine..
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Do you measure out the water using the measurements on the bottle and then pour it into the rapid cool? I realised that the measurements on the Mam bottle are actually wrong. They’re half an ounce out so when I make a 7oz bottle I pour in 7 and a half oz using the bottle as a measuring cup then pour it into the rapid cool

Mines the same, I made 7oz takes it up to 8. Even if I use rapid cool it takes it up to just below 8. Never had any problems though but I did find it sooo weird at first. Maybe this bottle as it’s the smaller one the bottle is not as wide at the top so makes it look more x

Prep machine adds a lot of air too - you can see all the bubbles. If you let it settle for a bit I bet the volume would reduce.

I got rid of mine due to reading up a lot of similar problems with prep machines. Not giving out enough or too much water and also not boiling to the correct temperature. Also more colic symptoms.
I just went to the hot shot method instead

Mines the same always adds at least half an oz extra of water 🙄

I used a prep for a week with my daughter when she was newborn, gave her terrible wind! I’d recommend the nuby rapid cool! Easy to make on the go aswell!