Early Childhood Development (Pre-K–2)

This is the most rapid period of brain development your child will ever experience — and understanding what’s happening can change how you read everything from a tough drop-off to a school’s discipline approach.

The brain is building itself, fast

During the first few years of life, a child’s brain forms over one million new neural connections every second. Genetics provide the starting blueprint, but it’s actually a child’s experiences — especially their relationships with caregivers and teachers — that shape how that blueprint gets built out. This isn’t a one-time event; it’s continuous through these early grades.

Why this matters for behavior

Young children in Pre-K through second grade are not capable of the kind of self-control adults sometimes expect from them. Their brains physically can’t yet regulate emotion, attention, and impulse the way an older child’s can. A behavior that looks like “defiance” or “manipulation” to an adult is very often something much simpler: an overwhelmed nervous system that hasn’t yet developed the tools to cope.

Discipline approaches matter enormously at this age

Because the brain is so actively forming, how a school responds to challenging behavior in these years can shape a child’s long-term relationship with school itself. Research has found that out-of-school suspensions and expulsions happen at alarming rates even in early childhood programs — and that Black children are suspended and expelled at higher rates than white children at this age. These early disciplinary experiences can be retraumatizing and add stress on top of whatever a family may already be navigating.

If your young child is facing repeated discipline referrals, suspension, or expulsion, see Discipline & Suspension Rights and Trauma-Informed Discipline for what schools should be doing differently.

What good practice looks like at this age

Programs built around children’s developmental reality — rather than adult expectations of compliance — tend to focus on:

• Helping a child feel safe first, before trying to correct behavior
• Recognizing that a child in “fight, flight, or freeze” is not making a choice — their brain has gone into an automatic survival response
• Responding to dysregulation with connection and support rather than isolation or punishment

What to watch for, and ask about

• Does the school’s discipline policy account for developmental appropriateness at this age, or does it treat a 5-year-old the same as a 15-year-old?
• If your child is suspended or removed from class repeatedly, ask what alternative, less punitive strategies were tried first
• If your child has a documented disability, remember that early childhood special education evaluation and services are available — see Pre-K3 Programs

This page is for informational purposes only and does not replace guidance from your child’s pediatrician or a qualified child development professional.