Oh god, another one trotting out the crap about not being able to tell by looking at someone whether they were breastfed. Of course not, because you can't see someone's immune system, or their microbiome, or their propensity to asthma by looking at them. Nor can you tell how many ear infections and gastro issues they had as a baby etc e
No but we do know that there is evidence suggesting minimal difference in outcomes between formula fed and breast fed siblings, suggesting selection into breastfeeding is a big factor in outcomes. There is a study (in Brazil) I think which found a bigger difference not by using siblings but by otherwise attempting to account for this selection. The truth is it isn’t clear, but no one with access to clean drinking water and a kettle needs to fear they are doing any harm by their child by formula feeding. It is crucial women know this and don’t think they are failing their child by formula feeding, and nor are they to blame if their child gets an infection etc.
Female biology is unique and precious and cannot be replicated. But that doesn’t mean we shouldn’t be doing our best to create the best possible formula for women who can’t or choose not to breast feed. It will never be the same. But it is a valid alternative for women.
Just because women, and only women, can breastfeed does not mean they should, not unless they want to. Only women can be pregnant and grow a child but obviously they should not be required to do so if they don’t want to. This is why access to reproductive services is crucial. Likewise breastfeeding. Women who want to should be supported, and women who don’t want to should also be supported. This includes trying to create the best possible alternative, and not judging her, and ramming down her throat that breastfeeding mums are doing better by their child than she is for hers.