Friend making formula with cold water

[marzipananimal]

I'm looking for a bit of advice on how to deal with this tactfully, if at all.

My friend has started introducing ff to her 9 month old and I noticed she mixed the powder with cold water. I know about the risks and preparation guidelines etc and feel a bit uneasy.
Should I say something? If so, what?
I don't want to offend, especially as I don't use formula (though I did when DS was newborn for a bit so I know how to use it).
She may know the risks and have decided to do it anyway, which is her decision, but given that she has bf up til now she may not know.

Any advice?

Out of the fridge it only lasts 2 hours.

Refridgerated it will last 24 hours, but personally I wouldn't make 24 hours up in one go, I think that's pushing it a bit. Making a couple at a time so you're always one ahead of yourself seems a good compromise.

The thing people believe what they want to believe and hear what they want to hear, regardless of what the advice is. I once made a similar comment to a FFing friend, "oh, I thought I read somewhere it needs to be done with hot boiled water to sterilize the powder" and she said, "nooo, I'm sure that's fine" (her making it with cooled boiled water). I would at least bother to check if someone made a comment like this to me. You can say it for your own piece of mind but don't count it will actually be taken on board as it's not convenient to implement and people don't like being pointed out they're wrong.

What I don't understand is the 70 degrees benchmark. Does it mean that milk should be made with water which is at least 70 degrees hot, or does it mean that water should not be above 70 degrees (i.e. maybe water hoter than 70 degrees destroys the protein in the milk?)? Why does the guidance say that water should be cooled down to 70 degrees, can't I just use boiling water full stop?

At least 70c - ideal is between 70-80C. I believe water hotter than that can destroy some of the nutrients, particularly vitamin C, which is mostly an issue for very young babies.

My elder DD is 7 and she had nothing but room temp from day one....

We used to add 4oz of boiling water to the powder to sterilise and then 2oz cold tap water to take it to right temp (or more if necessary).

This was over the age of 6 months though.

I think the most important thing it not using the formula after it has been made up for 2 hours.

Since the powder is dry, bugs won't survive in it (presuming its kept dry etc). But their spores could be dormant in the powder which, when the powder is added to water, could multiply to a significant (dangerous?) level - obviously this happens over a period of time and will be fastest at a lovely warm drinkable temperature.
2 hours is a standard time for this kind of thing - hot food counters etc all have to stick to this 2 hour limit for keeping food warm.

When it comes to whether the water is boiled or not, I would expect its more to eliminate nasties that come in with the water (dirty taps etc - i have a pet hate for people who wash raw chicken in the sink and then drink water out of the tap that chicken-y water has just sprinkled all over).

I would thought that if you are giving you 9 month old water from the tap to drink, its the same water once you put formula into it. The key is not leave the milk hanging about too long.

Agrumino 70 degrees comes in because 'things' live and reproduce nicely up to about that temperature - called the danger zone.
Hotter temps kill bugs off - the hotter the water is, the better it'll do so, but you then have to balance the risks of scalding (knackered parents juggling boiling water in one hand and crying baby in other hand etc)

I realise this is an old thread but just incase anybody googles this a lot of answers on here are misleading and incorrect.
Formula has to be made up at 70C as this is the correct temperature to kill bacteria/bugs within the dry powder. Any hotter kills the nutrients in the powder. The reason the water has to be boiled first then cooled to 70c (cooled boiled) is because babies under 6 months aren't allowed tap water and boiling it first kills anything in the water. Best to always follow guidelines unless you're happy to risk your babies health. The guidelines are there because babies have been made ill by the process not being followed. Just because some people's babies have been fine doesn't mean they all will be so is it really worth he risk?