A study conducted by the University of Queensland Institute for Social Science Research in Australia has found that mothers who went back to work full time were less likely to breastfeed their newborns through the first six months of life, compared to those who went back to work for 19 hours or less per week. 60% of mothers working full time quit breastfeeding before their child hit the 6 month mark, versus only 10% of mothers who worked 19 hours or less. The researchers stressed that governments and employers need to keep this fact in mind and provide incentives for women to delay their return to work.
See "Long work hours hinder breast-feeding for new moms", Dennis Thompson, CBS, May 16, 2016