In 1956 Kerwin's sister-in-law, Mary White, invited her to the inaugural meeting of La Leche League at White's home. The idea for a breastfeeding advocacy organization was developed by White and Marian Tompson while they breastfed their infants at a church picnic in summer 1956. At the time, American mothers interested in natural childbirth and breastfeeding received little support from the medical community. In the US, only one in five newborns were breastfed from birth; most were immediately fed from bottles. Other women approached the two to discuss their experiences breastfeeding their infants and the discouragement they had received from pediatricians. White and Thompson decided to start a breastfeeding advocacy group and invited a few women, who invited their acquaintances; the seven founders were White, Tompson, Kerwin, Edwina Froehlich, Viola Lennon, Mary Ann Cahill, and Betty Wagner, all Catholic mothers. Kerwin, expecting her second child at the time, had received help from White and her husband, Dr. Gregory White, a family doctor, to successfully breastfeed her first baby. The women held several meetings at White's house in Franklin Park, Illinois, to discuss the type of information and support breastfeeding mothers would need. They held their first official meeting on October 17, 1956 at White's house, attended by the seven founders and five of their acquaintances who were expecting. Their second meeting drew 30 attendees, and the fourth attracted a standing-room-only audience. The women developed a series of monthly educational meetings, and near the end of the decade began publishing informational material. In 1958 Kerwin co-authored the group's first handbook, The Womanly Art of Breastfeeding. In 1960 the Kerwins moved to Denver, where they purchased the Cranmer House, residing there for three decades. Kerwin founded the Colorado chapter of La Leche League and also served as chair of the international board.
Legal career
In 1986 Kerwin earned her J.D. at the University of Denver. She practiced family law and general litigation until retiring. As the Colorado Breast-feeding Task Force Legislation Representative for the Colorado Breast-feeding Coalition, Kerwin drafted several pieces of legislation on behalf of nursing women. The two that were passed into law were the 2004 Breastfeeding in Public Act and the 2008 Nursing Mothers' Act for Workplace Accommodation. In 2006 Kerwin withdrew her draft legislation aimed at protecting a woman's right to pumpbreast milk in the workplace due to lack of support from the governor.
