The NHS advice does seem overwhelming, but it’s there to protect your baby from infections and ignoring it may work for some people but not everyone is lucky and formula fed babies do get gastroenteritis and other illnesses from the bacteria in powdered formula. To make powdered formula as safe as possible it has to go into water of at least 70°C, and then be cooled and fed within a short time, @FancyShmancy’s ’advice’ may seem like a good idea but it’s not, not really.
Readymade formula is pasteurised so doesn’t have the bacteria in it that powdered does. However it still carries risk as there’s none of the immune factors that are found in breastmilk, so you do still need to be careful to sterilise bottles etc for the first 6 months at least.
I know you haven’t asked about it, but is there a reason you are (planning to) formula feed? Is breastfeeding genuinely not an option? I know we hear horror stories about breastfeeding struggles, but with the right help and support it can be so much easier than formula, it’s always ready, no prep, no sterilising, no calming a hungry baby whilst you wait for a bottle to be ready…..
Don’t come at me with ‘Fed is best’ and ‘not everyone can’, fed is a basic need, and what babies are fed does matter, and it matters for long term maternal health too.
Anyway, the phone number etc on the picture will put you in touch with trained, non-judgemental, factual advice, rather than anecdotal ‘I did this and my kids survived’ comments.