Starting early, ages 0–3: closing the achievement gap
Research indicates that children who enter high-quality early childhood education before age 3 achieve significantly greater language and cognitive gains than those who wait until the year before kindergarten.
80% of human brain development occurs before age 3. Our brains grow faster between the ages of 0–3 than at any later point in our lives. This rapid growth in the first few years is why early learning experiences, good nutrition, and social interactions are so crucial — as experts at Harvard’s Center on the Developing Child and UNICEF note. It lays a strong foundation for success in school and the workforce.
Starting in infancy (age 0–3)
Starting in infancy leverages a critical period when the brain forms one million new neural connections every second.
- Gap prevention: high-quality care from birth can prevent the “achievement gap” from forming. By age 3, children without access to quality early learning may already have language scores significantly below the national average.
- Language & cognitive boosts: infants in high-quality settings often show better language acquisition and cognitive development.
- Social foundations: early exposure helps infants form secure attachments with varied caregivers and begin the foundations of cooperative behavior.
- Early intervention: starting early allows for earlier detection of developmental delays, making interventions more effective during peak brain plasticity.
Age 4 & later
- Academic readiness: the focus shifts to structured kindergarten readiness — early literacy, numeracy, and following multi-step instructions.
- Social maturity: four-year-olds are ready for collaborative play, sharing, and navigating group dynamics.
- Emotional resilience: older children begin to self-regulate their emotions, making the transition to a structured environment smoother.
Important note: the quality of the program (responsive caregivers, low child-to-staff ratios, and a stimulating curriculum) is often more predictive of long-term success than the starting age alone.
Sources: Harvard Center on the Developing Child; UNICEF; CDC; U.S. Chamber of Commerce Foundation; The Hechinger Report.