Yes. Facebook agrees that breastfeeding is natural and beautiful and they are glad to know that it’s important for mothers to share their experiences with others on Facebook. The vast majority of these photos are compliant with Facebook policies.
Please note that the photos Facebook reviews are almost exclusively brought to their attention by other Facebook members who complain about them being shared on Facebook.
Source: https://www.facebook.com/help/340974655932193?helpref=uf_permalink