The water needs to be at least 70C to kill any bacteria in the formula. So using warm water that is cool enough for baby to drink isn't going to kill the bacteria that could make baby very ill.
And the Aptamil instructions state clearly to boil the kettle and leave no longer than 30 minutes. Not to wait 30 minutes before making a feed. Other formulas don't take that risk and say to leave the water for no longer than 10 minutes to ensure its hot enough.
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As it says - Leave kettle to cool for 30 minutes and no longer. Opposed to 'boil the kettle and leave no longer than 30 minutes.'. Hence why many, many others have also followed the instructions as I have (you only have to look through previous threads on feeding and in the formula section, particularly when people are discussing the prep machine). Also why the community midwife team and my Health Visitor have read the instructions the same way I have. If it said 'boil the kettle and use within 30 minutes', that would be a different matter. However it doesn't.
The website however says "Boil 1 litre of fresh water. Leave kettle to cool for no longer than 30 mins.", so I called the customer services number to query which one is actually correct, the website or the packaging. They couldn't give me a straight answer, but agreed that yes, the packaging
does say leave the kettle to cool for 30 minutes and yes, that does imply before use.
I'm awaiting an email from the customer services to explain why the website and the packaging have different instructions.