How do you measure formula?

Ok, so might be a rather weird and random type question.....a 'disagreement' with another person has made me rethink.

When you measure formula - say it says 200ml water with 4 scoops of formula - do you consider that bottle to be 200ml or (as I have always) measure it from the height it ends up once mixed. A 200ml bottle once formula is added ends up say 250ml. So I call that 250ml and if the child drinks half, I say they've drunk 125ml.

Whereas the other person says if the bottle has 125ml left in it, the child has drunk only 75ml.

Am I wrong? This is how I have always done it, for 10 years or more of making up bottles and now someone's questioned it, I'm second guessing myself....

I can't imagine how it can be calculated any other way to be honest?!
What a weird conversation that must have been for you!

Do you mean how I am doing it?

The other person counts it as 200ml regardless of the formula making it far more full.....or are they right?

Your way sounds the right way to me!

If they counted it as 200ml then they aren't including the actual formula in their calculations of what bubs is drinking?! I find it quite odd but I guess it can be a matter of opinion...

The solution is made in 200ml of liquid, which measures 250ml when made up.

Chemistry teacher says 250ml of solution. So if after drinking it is at 125ml, child has drunk 125ml of solution.

Yes, once prepared, with all elements added, it's 250ml. Water is just one of the two 'ingredients' in the formula solution. Whoever you were talking to is very wrong. How weird!

Thanks ladies, I thought I was right, but so did the other person.

I'm kinda with the other person, however I never really say to myself 'DD has drank 125ml, but more she has 125ml left'... I don't really pay attention to the made up amount, just that it started at 200ml

Then again, I've never thought about this situation until now lol

If you don't add that extra 50ml, over a space of a day, your child is having the equivilant of an extra whole bottle, isn't it?

what does the tin say? (in terms of how they determine amount needed each day)

My tin says 180 ml of cooled boiled water, 3x scoops of formula 5 times per day. I go off the 180 ml but as I'm sticking to the 5 times a day he isn't getting an extra bottle as such.

Just like liquid antibiotics made from powder it says (for the pharmacist) to add 60mls of water. Which then makes a 100ml bottle then you take the dose from that so 2.5mls not creating another calculation like baby had 2.5mls. - powder volume= whatever this is my maths is not good lol. I've never used formula so just using this as another example.

So yes it's whatever the made up volume equals not the added liquid volume.

I've never used formula, but I would make it up the way you said ausgirl, so add 200ml of water to the powder, which would make 250ml (or whatever it ended up being!)