Many mothers and those who support them do not know that they can experience negative emotions associated with breastfeeding. In modern society breastfeeding is often used - problematically - to exemplify myths about motherhood and maternal love, and is bound up with ideas of what makes a 'good mother'. In this context nursing aversion and agitation - intense, distressing feelings that are experienced by the mother during breastfeeding - can be both unexpected and hugely upsetting, particularly when women may have already overcome significant challenges in order to breastfeed. In When Breastfeeding Sucks Zainab Yate examines what we know about this poorly understood aspect of infant feeding, in a carefully researched discussion that will be valuable for individual mothers who may be suffering, and the breastfeeding supporters who work to support them.