Study results reveal that yearly financing needs to provide maternity cash transfers (MCT) for women of reproductive age (WRA) in the informal sector would not exceed .5% of Indonesian GDP and could provide significant public health savings and partially alleviate the economic cost of not breastfeeding in Indonesia, which is estimated at US$1.5-9.4 billion annually. The MCT would substantially contribute to breastfeeding success for Indonesia’s WRA, over half of which are employed in the informal sector.