The shared experience of poring over the pictures in a book with a child can feel like a luxury for many parents and carers as they juggle the responsibilities of parenthood. But the value of these early interactions cannot be overestimated. Professors Lynne Murray and Peter Cooper have worked with parents and children in low- and middle-income countries for more than 20 years to assess the impact of early parenting interventions on child development. Here they tell us how a simple, inexpensive intervention to promote sensitive book-sharing can help child development and support the largest group of potential educators – parents.