I don't think is what the person was looking in terms of statistics on bf,
but here are two interesting references:
Salmon, Marylynn 1994
"The Cultural Significance of Breastfeeding and Infant Care in Early
Modern England and America," Journal of Social History, 28(2):247-269.
Treckel, Paula A. 1989
"Breastfeeding and Maternal Sexuality in Colonial America," Journal
of Interdisciplinary History, 20(1):25-51.
Kathy Dettwyler
Queen of References