Just to emphasise this point - Mistigri, the Lancet is a journal where playing 'fast and loose' with the stats would be unlikely. The paper itself - available, free, online here:
and if you register (again, free) you can read the whole thing - does not use emotive language. It is sober, referenced, and shows you its workings-out, IYSWIM.
By looking at a wide range of research, it calculates what the health impact and public finance impact might be, if more babies, in general, were breastfed, and were breastfed for longer.
This is not an instruction to individual women, but useful information for governments, agencies, HCP training organisations, demonstrating the evidence that support and enablement of breastfeeding is worthwhile.
Support and enablement does not mean pressurising women; it does not mean saying how great breastfeeding is, and then letting women struggle in pain and confusion with it when it doesn't work well. It doesn't mean being evasive about information related to formula feeding, either, making women worry about feeling marginalised and judged.
It means making sure maternity and paternity leave is generous and paid for; that workplaces enable continued breastfeeding (by making it easy to express and store at work); that public places make it easy and comfortable to breastfeed; that HCPs are trained in resolving problems; that hospital maternity units are well-staffed with knowledgable people; that community HCPs are well-trained; that unethical marketing of formula is stopped and false claims about formula are banned.