Early childhood development programmes vary in coordination and quality, with inadequate and inequitable access, especially for children younger than 3 years. New estimates, based on proxy measures of stunting and poverty, indicate that 250 million children (43%) younger than 5 years in low-income and middle-income countries are at risk of not reaching their developmental potential. There is therefore an urgent need to increase multisectoral coverage of quality programming that incorporates health, nutrition, security and safety, responsive caregiving, and early learning. Equitable early childhood policies and programmes are crucial for meeting Sustainable Development Goals, and for children to develop the intellectual skills, creativity, and wellbeing required to become healthy and productive adults. In this paper, the first in a three part Series on early childhood development, we examine recent scientific progress and global commitments to early childhood development. Research, programmes, and policies have advanced substantially since 2000, with new neuroscientific evidence linking early adversity and nurturing care with brain development and function throughout the life course.

Despite dramatic improvements in survival, nutrition, and education over recent decades, today's children face an uncertain future. Climate change, ecological degradation, migrating populations, conflict, pervasive inequalities, and predatory commercial practices threaten the health and future of children in every country. In 2015, the world's countries agreed on the Sustainable Development Goals (SDGs), yet nearly 5 years later, few countries have recorded much progress towards achieving them. This Commission presents the case for placing children, aged 0-18 years, at the centre of the SDGs: at the heart of the concept of sustainability and our shared human endeavour. Governments must harness coalitions across sectors to overcome ecological and commercial pressures to ensure children receive their rights and entitlements now and a liveable planet in the years to come.

The Sustainable Development Goals offer the global health community a strategic opportunity to promote human rights, advance gender equality, and achieve health for all. The inability of the health sector to accelerate progress on a range of health outcomes brings into sharp focus the significant impact of gender inequalities and restrictive gender norms on health risks and behaviours. In this paper we draw on evidence from the Series on Gender Equality, Norms and Health to dispel three myths on gender and health and describe persistent barriers to progress. We propose an agenda for action to reduce gender inequality and shift gender norms for improved health outcomes, calling on leaders in national governments, global health institutions, civil society organisations, academia, and the corporate sector to 1) focus on health outcomes and engage actors across sectors to achieve them; 2) reform the workplace and workforce to be more gender equitable; 3) fill gaps in data and eliminate gender bias in research; 4) fund civil society actors and social movements; and 5) strengthen accountability mechanisms. Paper 5 Lancet Series on Gender Equality, Norms and Health Key Messages of the Series • Gender norms and inequalities affect health outcomes for girls and women, boys and men, and gender minorities.

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In 2003, Nigeria adopted the Family Life and HIV Education (FLHE) sexuality education curriculum. Our analysis interrogates variation in sub-national implementation. We conducted 52 interviews with persons knowledgeable about the curriculum in three states-Kano, Lagos, and Niger-and reviewed publications on FLHE. In Kano, the socio-cultural context impeded implementation, but the persistence of innovative local champions resulted in some success. In Lagos, the cosmopolitan context, effective champions, funding by international donors, and a receptive government bureaucracy led to successful implementation. In Niger, despite a relatively conservative socio-cultural context, state bureaucratic bottlenecks overwhelmed proponents' efforts. In summary, the interaction of socio-cultural context, domestic champions, adaptive capacity of state bureaucracies, and international funders explains variable implementation of FLHE. The Nigerian experience highlights the need for sexuality education proponents to anticipate and prepare for local opposition and bureaucratic barriers.

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