There’s a small Head Start classroom in Frederick, Maryland where a three-year-old stacks Duplo blocks with the focused intensity of someone solving a serious problem. She doesn’t know she’s also navigating one of the most consequential periods of her entire life. But the researchers do. And increasingly, so do the policymakers who study what happens when the systems meant to support children like her actually fail to talk to each other.
The Center for American Progress has spent years making the case that child wellbeing isn’t just a health issue, or just an education issue, or just an economic one. It’s all three, simultaneously, and treating them as separate conversations is part of why the United States — one of the wealthiest nations in history — still has one of the highest child poverty rates in the industrialized world. The research is uncomfortable in the way that obvious things sometimes are: children’s development during the birth-to-six window is so sensitive, so shaped by access to stable housing, nutritious food, quality early education, and dependable healthcare, that failing on any one of those fronts tends to unravel progress on the others.
The social determinants of health aren’t new as a concept. What’s newer, and arguably more urgent, is the policy architecture CAP is now describing — one that treats those determinants not as separate bureaucratic lanes but as interlocking gears that have to turn together. Medicaid and CHIP. Head Start and Early Head Start. SNAP. The child tax credit. Community Development Block Grants. These programs didn’t emerge from a single coherent vision; they grew up in silos, funded separately, often evaluated in isolation, administered by agencies that have historically had limited reason to coordinate. The result is a patchwork that works reasonably well for some families and leaves others falling through the gaps — usually the families who can least afford it.
The COVID-19 pandemic clarified this in ways that were hard to ignore. When the American Rescue Plan expanded the child tax credit, child poverty dropped to 5.2 percent in 2021 — the lowest on record. Then Congress declined to renew it. By mid-2022, food insecurity among families with children had spiked 25 percent. Those numbers represent real kitchens, real dinner tables, real parents making impossible calculations about what to buy this week. It’s hard not to notice how quickly the gains reversed, and how little policy continuity seemed to exist for the children most affected.
What CAP’s research framework lays out — across reports covering the perinatal period, infancy, toddlerhood, and preschool years — is a multigenerational argument: that early investments compound. Not in the abstract, feel-good sense of “investing in the future,” but measurably. Nobel laureate James Heckman’s economic modeling has shown for years that the return on investment in early childhood development is among the highest of any public expenditure, precisely because children’s brains and bodies are so responsive to their environments during the early years. The window isn’t permanent. It’s not clear we fully act like we know that.
There’s also a racial equity dimension here that the research doesn’t let slide past. Black children and American Indian and Alaska Native children face disproportionately high poverty rates — 27 percent and 29 percent respectively, compared with under 9 percent for white children. Systemic inequities in housing, environmental quality, healthcare access, and educational resources don’t arrive independently; they cluster. A child growing up in a neighborhood with high pollution, underfunded schools, limited healthcare providers, and housing instability is facing all of those pressures at once, during the years when they’re most developmentally costly.
The preschool period — roughly ages three through six — is where CAP’s latest detailed report focuses. These are the years when children start developing self-regulation, when the neurological foundations laid in infancy begin translating into behavioral and cognitive skills that will carry through adolescence and into adulthood. Missed well-child visits during the pandemic, gaps in immunization schedules, lost intervention services for children with disabilities — these aren’t minor administrative inconveniences. They’re interruptions in a developmental sequence that doesn’t simply pause and resume.
There’s a broader political problem lurking here too, one CAP addresses somewhat carefully. Persistent cultural attitudes in the United States treat child-rearing as fundamentally private — a family responsibility, not a state one. That framing has real consequences for how much political will exists to fund family support programs robustly, or to view early childhood policy as the economic and public health infrastructure that the evidence suggests it is. The federal government currently spends about 9.8 percent of its budget on children under 18, a share projected to fall to 6.2 percent by 2033. By that same point, the government is expected to spend more on interest payments on debt than on children.
Whether any of this translates into durable policy change remains genuinely uncertain. The evidence has been clear for a long time. The problem isn’t the research.
