The French Ministry of Health's National Nutrition Health Program has published a 70+ report on maternal breastfeeding (subtitled 'benefits for mothers and infants'). It is available in PDF
here.
It is fairly pro-breastfeeding on the whole and is written for health and early childhood professionals, with the aim of promoting breastfeeding.
It ends with 12 "main messages" summarised at the end.
1 = there is no "bad milk" and that "all women" can produces enough milk of sufficient quality--if they "are confident/trust they can/supported".
2 = exclusive maternal breastfeeding for 6 months, when solids should be introduced. It specifies that there is no reason to introduce solids before 6 months. And states that breastfeeding "can continue up to 2 years or longer if the mother so wishes". (Earlier in the report, in a couple of places (two or three) it specifically states that there is no reason to end breastfeeding early and that there are no reasons not to continue "if the mother wishes".)
3 = "no matter what the reasons, psycho-affective, nutritional or environmental" breastfeeding is associated with positive benefits that it would be a shame to not provide infants with.
4 mentions the reduction in ear infections, respiratory diseases, etc.
5 = exclusive and prolonged (at least 6 months "exclusive" followed by BF + solids) BF reduces risks of allergies.
6 = reduced risk of obesity with BF
7 = need to supplement with Vit D & K and floride
8 = absolute "do not breastfeed if HIV+"
9 = OK to BF with Hepatitis B & C
10 = "very few medications" make it impossible to continue breastfeeding
11 = formally recommends against breastfeeding if smoking (cigarettes or pot), drinking, or taking (other) illegal drugs
12 = premees can be fed BM if they are supplemented (calories, protein, minerals)
That said, the reason they had to write the report, IMO, is that there is often (but not always) a rather breastfeeding-unfriendly (or just breastfeeding-ignorant) current among many pediatricians, nurses, etc.... and many daycare center workers/directors. Despite official policies stating that daycare centres can and must agree to feed expressed BM if the parents request that they do so and supply the milk, many refuse to do so. And the ones that do do so still have to follow official recommendations on storage etc. (which are not always logical--for ex. I would pump at work for DD, when I'd pick her up at daycare they could NOT take the day's output and put it in their fridge--I had to take it home, put it in the fridge there, and bring it back to them the next morning; they also had to dump it out if she didn't finish the bottle within the same 1/2 (I think) hour guideline that they had to use for formula).