If companies follow the WHO code on marketing as a minimal ethical standard, they don't have to stop all marketing - it just has to be done in a way that protects the (often fragile) choice to breastfeed, and does not mislead or under-inform mothers who use formula.
It's fair enough for healthcare professionals to know about changes in formulation, for instance, and they need to know about them. Same goes for parents. But these changes should be health led so we don't get additives and processes for primarily commercial reasons, and the changes should be closely monitored and researched, with years (not weeks) of follow up after a change. There should be a system of reporting back (as there is with medicines) so side effects and problems can be monitored. Isn't it astonishing that there isn't? Currently, HCPs and mothers swap anecdotes about brand X causing wind, brand Y causing constipation, brand Z bringing babies out in a rash....and there is no consistency. Maybe these anecdotes have some basis in fact, and if so, someone should be collecting the information so it can be disseminated.
There needs to be some centralised control, with manufacturers making minimally-branded, non-commercial formula, with ingredients independently compared, and with the product widely available at a consistent low cost. If it turns out that one of the new ingredients is important for the health of ff babies, then it should be in all brands.
Everyone knows formula exists. The availability of it does not need to be advertised. People who need to use it because their babies are not breastfed, or not fully breastfed (for whatever reason), should be aware of the health effects of using it - not to feel criticised or undermined, but because we all need to know the effects of anything we use with babies in order to decide how much, how long, and if, to use it.
Formula manufacturers should not be permitted to market themselves or their products to pregnant and new mothers, as the cumulative effect of this is to undermine breastfeeding. There is no one single aspect that would 'change someone's mind' - so the celeb, the DVD, the ad, the pretty pack, the spurious sloganising, the 'baby club', the gift of a piece of branded tat to the health visitor, the 'care line etc etc all combine to work with each other, in a way that breastfeeding promotion can never achieve. It all needs to stop.