By Stage.

How learning changes across seven overlapping developmental lenses.

How To Use This Page

All four Learning Engine capacities begin developing early and continue changing together. The seven stages are navigation labels for overlapping developmental lenses. Each lens highlights a period when a developmental theme often becomes especially visible or changes rapidly.

Each section below shows what may be especially visible, what caregivers may notice, and what they can try. The age ranges are approximate. Children may show features of several lenses at once, and development does not follow one exact timetable.

No stage is a test, diagnosis, or step a child must complete before another capacity can develop.

Use this page to become more curious about the child in front of you, not to place them on a level.
Stage 0  ·  Regulation Core

Feeling Safe

Birth – 3 Months

In the first months, physiological state, feeding, sleep-wake organization, recovery from distress, and caregiver-supported regulation are especially visible. Newborns are also already attending, learning, recognizing familiar people and patterns, and remembering in early forms.

What Is Becoming Especially Visible

The baby is gradually becoming more organized across states of sleep, alertness, feeding, and distress. Regulation is highly supported by caregivers at this age.

Your Role

Respond to cues. Use your voice, touch, feeding, holding, movement, and pauses to help the baby settle and re-engage. You do not need to stimulate constantly. Looking away, fussing, or needing a break is information too.

Learning Engine Emphasis  /  Regulation receives the strongest emphasis in this lens, while attention, memory, curiosity, language, movement, and learning are already underway

What You May Notice

  • Calming with a familiar voice, touch, or hold
  • Short periods of quiet alert attention to faces, voices, light, or movement
  • Growing familiarity with recurring routines and people
▶  "Where Learning Begins"

The first months place regulation in the foreground while learning, attention, recognition, and memory are already active.

Stage 1  ·  Attention Anchoring

Noticing the World

3 – 12 Months

Visual control, reaching, sustained engagement, social attention, and shifting become more organized across this period. Attention was present from birth. This lens highlights growing control, duration, and coordination.

What Is Becoming Especially Visible

The child is increasingly able to stay with people, objects, sounds, and events long enough to gather more information from them.

Your Role

Follow the child's gaze and interest. Name what they are already noticing. Pause and allow time for a look, sound, reach, or turn away. Shared attention grows through ordinary back-and-forth interaction.

Learning Engine Emphasis  /  Attention receives the strongest emphasis in this lens

What You May Notice

  • Looking longer at faces, objects, and movement
  • Shifting attention between a caregiver and something interesting
  • Following a point or gaze and returning attention to the other person
▶  "Where Focus Begins"

Attention becomes more organized and sustained while the other capacities continue developing with it.

Stage 1.5  ·  Representation

Where Did It Go?

9 – 16 Months

Stored information becomes increasingly usable in action. Children may search, anticipate routines, imitate after a delay, and coordinate memory with movement in new ways. This is not the first appearance of memory or representation. It is a period when these abilities often become easier to see.

What Is Becoming Especially Visible

The child is increasingly able to use what happened before to guide what they do now, including searching for something that disappeared or anticipating what comes next.

Your Role

Play simple hiding and finding games. Repeat familiar routines. Pause before a reveal. Let the child search or anticipate before helping. Reliable returns and repeated experiences give memory something to work with.

Learning Engine Emphasis  /  Memory and representation receive special emphasis, while attention, regulation, curiosity, language, and action remain active

What You May Notice

  • Searching for an object after it is hidden
  • Anticipating familiar routines or actions
  • Imitating an action after some time has passed
▶  "When the Mind Begins to Hold More of the World"

Stored information becomes increasingly usable for searching, anticipating, and acting.

Stage 2  ·  Symbol and Autonomy

Naming and Choosing

12 – 24 Months

Words, gestures, pretend action, mobility, goal pursuit, and agency often expand quickly. Their timing and expression vary with language, culture, temperament, motor development, health, and support.

What Is Becoming Especially Visible

The child is increasingly using symbols to represent people, objects, and actions while also becoming more able and more motivated to act independently.

Your Role

Name what the child is already noticing. Offer simple choices when they are real choices. Let the child participate and try when it is safe. Teach directly when teaching helps, and keep boundaries clear without treating growing autonomy as defiance.

Learning Engine Emphasis  /  Symbolic use of memory, curiosity, language, and purposeful action becomes especially visible

What You May Notice

  • Rapid growth in words, gestures, or combinations of the two
  • Pretend actions with familiar objects
  • Strong interest in doing things independently or making choices
▶  "When Language and Independence Become More Visible"

Words, gestures, pretend action, and agency expand in overlapping ways.

Stage 3  ·  Logical Sequencing

Figuring Things Out

2 – 3 Years

Longer action sequences, planning, causal comparison, and revision often become easier to observe. This lens marks increasing complexity, not the beginning of logic or problem solving.

What Is Becoming Especially Visible

The child is increasingly able to hold a short sequence in mind, compare what happened with what was expected, and change an approach.

Your Role

Give time to try. Ask simple questions when they help. Offer a clue or explanation when frustration begins to overwhelm the learning. Direct teaching and independent exploration can both be useful.

Learning Engine Emphasis  /  Curiosity, memory, attention, and regulation work together during increasingly complex problem solving and revision

What You May Notice

  • Trying another approach when the first one does not work
  • Following or creating short sequences
  • Noticing patterns, causes, and changes in outcome
▶ "When Children Begin to Figure More Things Out"  ·  Coming Soon

Planning, comparison, and revision become easier to see in everyday problem solving.

Stage 4  ·  Narrative Coordination

Following the Story

3 – 4 Years

Children increasingly connect events, feelings, intentions, pretend roles, and accounts of experience. These abilities develop gradually and do not arrive through one neurological reorganization.

What Is Becoming Especially Visible

The child is becoming more able to organize experience across time and meaning. Stories, explanations, pretend play, and conversations about what happened become richer.

Your Role

Tell stories together. Talk about the day. Ask what happened first, what came next, and how someone felt. Let the child tell it imperfectly. Pretend play and direct conversation both create opportunities to coordinate memory, language, emotion, and attention.

Learning Engine Emphasis  /  Integration becomes easier to observe as the child coordinates memory, language, attention, emotion, knowledge, and social understanding

What You May Notice

  • Longer pretend-play themes and roles
  • Retelling experiences, sometimes out of order
  • Questions about motives, feelings, causes, and what may happen next
▶ "When Children Begin to Tell the Story"  ·  Coming Soon

Children increasingly connect events, intentions, feelings, and experience into narratives.

Stage 5  ·  Integrated Capability

Thinking and Learning

4 – 5 Years

Coordination across language, memory, attention, emotion, knowledge, and action often becomes more flexible and self-directed. Integration did not begin at four. This lens highlights a period when more complex coordination is often easier to see.

What Is Becoming Especially Visible

The child may stay with a challenge longer, use prior knowledge more deliberately, talk through a plan, shift approaches, and reflect on what happened.

Your Role

Invite planning, explanation, prediction, reflection, play, and direct teaching. Give room for independent effort while staying available for support. The goal is not to make the child solve everything alone.

Learning Engine Emphasis  /  Integration is especially visible here, but it has simpler forms from infancy and continues developing after age five

What You May Notice

  • Staying with a difficult task for longer periods
  • Using self-talk or explanation while working
  • Drawing on prior knowledge, changing plans, and reflecting on results
▶ "When Learning Comes Together More Flexibly"  ·  Coming Soon

The capacities are used with growing coordination, flexibility, and self-direction. Development is not complete at five.


Continue Learning

The science behind the lenses.

Each lens highlights a developmental theme that may become especially visible during a period. All four Learning Engine capacities continue developing throughout the first five years and beyond.

Explore the Science page to see how regulation, attention, memory, curiosity, integration, experience, and the wider developmental environment work together.

Explore the Science →