The US surgeon general stated that babies should be optimally breastfed for at least a year, and it was the lucky child who breastfed till age 2 or beyond.
Don't fall for the formula companies' bull****ting you that breastfeeding is only for tiny babies with no teeth. Older toddlers nurse for comfort more than food, and when they are sick or fighting off a germ, it is the best (and sometimes only) thing they can tolerate. Mothers can often also nurse through pregnancy and tandem nurse their older toddler and the new baby.
Working as a lactation consultant, I dealt with lots of different situations. Relactation because of a 2-year old going through chemo not tolerating food? Yup it can be done.
I don't think we should be judgy of other women's parenting choices. Breastfeeding is wonderful health wise with lifetime benefits for both mother and child, but when my patients want to bottle feed, I don't judge or preach. Every family is different, every baby's needs different.
A great book is The Politics of Breastfeeding, old but a real eye opener. The part about the dairy companies wanting something to do with leftover whey and deciding babies were their new customers is pretty revolting. And I'm sure the whole nestles boycott over sending expired formula to SELL in underdeveloped countries to women with no access to clean water with which to mix it, spending half the family income on the milk powder, umm sorry OK I will /end rant. Pet peeve.