And you're wrong. For a mother, breastfeeding reduces rates of: ovarian, womb, uterine and breast cancer, osteoparosis, type 2 diabetes,
But millions of women (including the majority of childless women) won't suffer from any of these things anyway. I notice Type 1 diabetes is not on your list; whereas type 2 diabetes is very much a lifestyle illness. The sort of lifestyle that more that is more common amongst demographics that are less likely to breastfeed.
and post natal depression.
Or maybe if BF works fine for you, you are less likely to be depressed.
For baby: Reduced rates of asthma, eczema, UTIs, ear infections, chest infections, heart disease (for premature babies, from four weeks!), obesity, childhood cancers, diabetes, mental health conditions, M.S., orthodontic issues... I could go on.
I can quite accept that BF might help prevent allergy-related complaints. However, if you have been BF, you still cannot eat excessive quantities of whatever you like and not expect to become obese. It would seem that BF, as a healthy lifestyle choice, is more of a correlation than a cause. Likewise 'orthodontic issues' whatever that actually means. You have not been specific here about which type of diabetes - that would be interesting.