We were definitely not talking about the very special dietary needs of highly allergic babies.
In general, it does not matter one jot if babies change formula.
Soya formula has its own risks, but some non-breastfed babies who cannot tolerate cows milk formula need it. Speciality formulas may be essential for the few babies who become ill on cows milk formula.
This was not what you were saying, Altinkum. You made the ridiculous assertion that it was 'lethal' and that hospitals would be 'overwhelmed' if babies changed formula.
Yes, formulas are not identical. The normal kinds are roughly the same, but may have some differences in some of the minor additives, which will make no difference to the health of the vast majority of babies, who can switch and have a different brand every day, without this being 'lethal'.
Sheesh. I do hope no one is reading this who has to change formulas because of (perhaps) the shop running out, or going abroad for some time where the brands are different and who is now scared her baby will end up being in hospital as a result.
I hope they can read you have made a mistake and you withdraw your assertions !