Early Childhood Policy: The Evidence for Investing Before School

The first few years of life are a period of rapid brain development unlike any other in the human lifespan. By age five, roughly 90 percent of brain development has occurred, and the foundations of cognitive, social, emotional, and physical health have been substantially laid. Research across neuroscience, developmental psychology, and economics has produced remarkably consistent findings about this developmental window: experiences in the first years of life shape trajectories that are difficult to alter later, and investments in early childhood produce returns that later investments cannot match. James Heckman, a Nobel laureate economist at the University of Chicago, has made the return-on-investment argument for early childhood in terms that have resonated across ideological lines. His research, drawing on longitudinal evaluations of several early childhood programs, shows that investments in early childhood education and development produce annual returns of 7 to 13 percent through improved educational attainment, employment, earnings, reduced crime, and lower reliance on public assistance. These returns substantially exceed the returns on investments in education or training at later stages. The argument is not only that early childhood is the right thing to do, but that it is the most economically efficient use of public resources for improving long-term outcomes. The Perry Preschool Project and the Abecedarian Project, two longitudinal studies that tracked participants from early childhood programs in the 1960s and 1970s into adulthood, are among the most cited evidence in early childhood policy. Perry participants showed higher educational attainment, higher employment rates, lower crime rates, and better health outcomes than control group members, with effects still detectable into middle age. Abecedarian findings similarly showed lasting effects on educational attainment, employment, and health. These studies have limitations, including small samples and context-specific implementation, but their consistency with each other and with subsequent research is compelling. Head Start, the large-scale federal early childhood program serving low-income children since 1965, has produced a complex evidence picture. Large-scale evaluations have found positive short-term effects on school readiness that fade in the early elementary years, a pattern known as fadeout. Critics have used fadeout findings to question Head Start's value. But longer-term follow-up studies, as well as research using natural experiments from program timing and geography, have found meaningful longer-term effects on educational attainment, crime, health, and economic outcomes that are not visible in the early elementary data. The fadeout of test score effects does not mean the absence of meaningful long-term impacts. Pre-K programs have expanded dramatically at the state level over the past two decades. Evaluations of state pre-K programs show generally positive effects on school readiness, with larger effects for children from lower-income families and those with less access to enriching home learning environments. Boston Public Schools pre-K, Tulsa's pre-K program, and several other well-studied programs show effects on school readiness, third-grade test scores, and in some cases long-term outcomes. Universal pre-K, while more expensive than targeted programs, may reduce stigma and improve program quality by mixing income levels. Home visiting programs, which provide support to parents of infants and toddlers in their homes, have accumulated a meaningful evidence base. The Nurse-Family Partnership, which pairs registered nurses with first-time low-income mothers for regular home visits through the child's second birthday, has shown effects in multiple randomized trials on child health, child development, and maternal outcomes including reduced rates of child abuse and improved maternal employment. Other home visiting models with positive evidence bases include Healthy Families America and Parents as Teachers. The Maternal, Infant, and Early Childhood Home Visiting program provides federal funding for these programs to states. Child care policy is closely related to early childhood development but often treated as a separate domain. Quality child care for infants and toddlers is extraordinarily expensive: costs in many markets exceed college tuition. Low-income families often access child care through subsidized slots that have long wait lists, or through informal arrangements of variable quality. Low-quality child care in the first years of life does not produce the developmental benefits of high-quality care and may produce harms in some circumstances. The evidence that quality matters in early childhood care is strong, and the policy infrastructure to ensure quality care at scale has not been built in the United States. The connection between early childhood policy and equity deserves emphasis. The developmental advantages or disadvantages established in the first years of life have lifelong consequences, and those first years are profoundly shaped by family economic resources. Wealthy families access enriched environments, high-quality child care, and stimulating early learning opportunities as a matter of course. Low-income families often cannot afford these inputs. Policies that ensure high-quality early experiences for all children, regardless of family income, represent one of the most direct tools available for reducing the reproduction of inequality across generations.