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Formula Mixing Bottles were designed to solve the problem when experts recommend that baby bottles should not be made up beforehand and the powder should only be mixed with the water just before feeding. This is because mixed formula breeds bacteria.  Whilst the formula comes in sealed tubs, it is not sterile and can contain Enterobacter sakazakii.  It is very rare for this to cause a problem but when it does it  can be fatal.

Baby Formula Bacteria

So I see a flaw in these bottles because the water has to be above 70 degrees C when you add the baby formula powder to kill the bacteria. The only way I can see them working is that the baby is drinking the formula immediately and then perhaps the bacteria doesn’t have time to breed, but in essence, your baby could potentially be drinking contaminated formula.  This is not a happy thought.

Having thought about the pro’s and con’s of this bottle, I can’t recommend it for twins or triplets parents, simply because I would not feed my babies milk that is potentially containing bacteria that has not been killed by the hot water.

This is a great shame as I could see that these bottles would definitely have been a space and time saving idea both when out and about with your babies, but also at night, being able to mix immediately before your babies need it, without having to measure out formula when half asleep.


These bottles were not available when I had my triplets.  I had a fridge in the babies nursery that I stored the ready made bottles in for the night feeds.  The  bottles were made up with boiling water directly onto the formula, killing the bacteria, then refrigerated ready for the overnight feeds. Making in advance is acceptable, as long as the bottles are refrigerated immediately and perfectly safe for my babies in the night.  They were premature and I did not want to compromise their already delicate immune systems with infections.  Ideally refrigerated milk should not be kept longer than 24 hours and after this time should be discarded.

Sadly I cannot recommend any of these bottles.  I feel that they fundamentally lose sight of the fact that formula is not sterile. So to add it to a bottle that you have spent time to  sterilise, with water that has been boiled and added to the bottle, so both sterile, to then add unsterile powder to water that will by then be cold is a step too far for me and definitely something that is not the ideal.

These bottles might have a place when your baby no longer needs sterile equipment but it still remains that the formula is not sterile and does require water at least over 70 degrees C to kill the bacteria.

The basis behind these bottles is that the formula powder is kept in a separate container within the body of the bottle, so that when your babies need feeding you press a button which releases the powder into the water, you shake and feed to your baby straight away.  The idea behind them is very good, a space saving, practical solution, sadly flawed by unsterile formula powder. Screen Shot 2016-04-27 at 00.00.17

This wasn’t supposed to be about formula at all but more about the bottles and which ones would suit your needs and your babies needs the best.  But as this has become a fundamental issue that formula is not sterile.  I will do a further blog on formula milk too, The Do’s and Dont’s on Baby Formula Powder.


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1 Comment

  1. This is very interesting, I hadn’t thought about this before when I was feeding my babies. I always used boiling water when making up the feeds. I can see that using cold water would not eradicate the bacteria in the formula powder. Great to bring it to everyones notice, I wonder if the manufacturers of these bottles know this ?

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