Breastmilk Money is a digital savings sub account that turns breastfeeding into measurable financial value. Built inside the Herconomy mobile banking app, it allows Nigerian mothers to calculate how much money they save by breastfeeding instead of purchasing formula and deposit that amount directly into savings. Using WHO intake averages and live local formula prices, the milk to money calculator generates a personalized monthly savings figure. With one tap, mothers can transfer the exact amount into a dedicated Breastmilk Money account and earn 14.3 percent interest, inspired by documented developmental benefits linked to exclusive breastfeeding. In a market where formula is heavily marketed as modern and respectable, and breastfeeding is often stigmatized or invisible, Breastmilk Money reframes care work as wealth. It gives mothers a practical tool to sustain healthy behavior while building financial security. Launched during Women’s Month, the initiative was supported by a short film, social education with medical professionals, live demonstrations, events, and out of home placements. Beyond awareness, Breastmilk Money embedded health advocacy into a real financial product, driving direct action, repeat engagement, and meaningful behavior change.