Uppsala University May 22 2025 Women who choose to stop treatment during pregnancy and breastfeeding are putting their health at risk, and have to weigh their desire to have children and breastfeed against a risk that we know very little about. In two ongoing clinical trials, researchers establish a new standard for human lactation studies that includes sampling of breast milk and plasma from both mothers and breastfed infants. The lack of scientific evidence is an ethical problem for women and