Since an old thread has been revivied, I'll just post this here:
https://www.theatlantic.com/magazine/archive/2009/04/the-case-against-breast-feeding/307311/
Yes, breastfeeding is good. But I agree with those who say that it's not "breast is best" but "fed is best". There are many, many women who cannot breastfeed for various reasons, and there is no reason to shame them. For those breastfeeding, you rock! And for those using formula, you rock too