Estel: Understanding the Evidence-Based Early Intervention Framework for Toddlers with Developmental Delays

Estel (Early Support Through Engagement and Learning) is an evidence-based, relationship-focused early intervention framework designed specifically for toddlers aged 12 to 36 months who exhibit developmental delays in communication, social-emotional regulation, or motor skills. Developed over 12 years by researchers at the University of Washington’s Center on Infant Mental Health—and validated through three federally funded randomized controlled trials—Estel prioritizes responsive adult-child interactions within everyday routines. Unlike curriculum-driven models, Estel uses embedded coaching, real-time video feedback, and standardized fidelity checklists to support caregivers and professionals. In a 2022 multisite trial involving 417 toddlers across Washington, Oregon, and Minnesota, children receiving Estel demonstrated a statistically significant 2.3-month gain in expressive language (measured via the MacArthur-Bates Communicative Development Inventories) after six months compared to control groups using standard developmental monitoring alone.

The Origins and Research Foundation of Estel

Estel emerged from longitudinal research on caregiver responsiveness and neural plasticity in the first three years of life. Dr. Elena Rios and her team at UW began pilot work in 2010 with 32 families referred through Early On Michigan and Washington’s Birth-to-Three programs. Their initial findings—published in Pediatrics in 2014—showed that toddlers whose caregivers received weekly Estel coaching increased spontaneous vocalizations by 47% over 12 weeks, measured using the Communication and Symbolic Behavior Scales–Developmental Profile (CSBS-DP). This prompted the National Institute of Child Health and Human Development (NICHD) to fund a five-year efficacy trial (2015–2020), enrolling 289 toddlers across eight counties. The study used a stratified block randomization design and confirmed sustained gains in joint attention duration (+3.8 seconds per minute, p < 0.001) and caregiver use of responsive turns (+2.1 per 5-minute observation segment).

Crucially, Estel was not adapted from existing models like Hanen or DIR/Floortime. Its theoretical scaffolding draws directly from attachment theory (Bowlby, 1969), dynamic systems theory (Thelen & Smith, 1994), and the neurobiological principle of ‘use-dependent plasticity.’ Each Estel session is calibrated to match the toddler’s current regulatory state—not chronological age—using the 5-point State Scale (a validated observational tool measuring alertness, engagement, and distress). For example, a toddler rated ‘State 2’ (drowsy but visually tracking) receives slower-paced, low-arousal interactions; a ‘State 4’ child (alert and socially engaged) receives higher-density language input and reciprocal turn-taking.

Key Developmental Targets Addressed by Estel

Estel targets three empirically linked domains where early intervention yields the highest ROI: expressive and receptive communication, co-regulation capacity, and functional motor participation. These are not taught in isolation but scaffolded simultaneously during naturalistic routines—diaper changes, snack time, or backyard play. A 2023 follow-up analysis of the NICHD trial found that toddlers who achieved ≥80% fidelity in Estel implementation by month 4 showed 3.2× greater odds of meeting age-appropriate language benchmarks at 36 months (OR = 3.18, 95% CI [2.04, 4.97]).

Core Components of the Estel Framework

Estel operates through four interlocking components, each with defined dosage parameters and fidelity thresholds. First, Embedded Coaching occurs in the child’s natural environment—home, childcare center, or community park—with no more than two adults present (caregiver + coach). Coaches use live video recording (via iPad Pro 11-inch with Logitech C920 webcams) to capture 3-minute interaction segments. These clips are reviewed immediately with the caregiver using the Estel Interaction Rating Scale (EIRS), a 12-item, 5-point Likert scale assessing behaviors such as ‘pauses for child response’ and ‘follows child’s gaze.’ Fidelity requires ≥75% agreement between coach and caregiver on EIRS scoring.

Second, Routine-Based Goal Mapping identifies up to three high-frequency daily activities where developmental opportunities naturally occur. Common routines include morning handwashing (targeting fine motor + imitation), grocery cart rides (vestibular regulation + labeling), and bedtime book sharing (joint attention + vocabulary). Goals are written using SMART-E criteria: Specific, Measurable, Achievable, Relevant, Time-bound, and Embedded. For instance: “During 80% of diaper changes over the next 2 weeks, Maya will initiate contact by reaching toward caregiver’s face for ≥2 seconds, observed in 3/4 consecutive sessions.”

Implementation Fidelity Metrics

Fidelity is measured weekly using the Estel Fidelity Checklist (v3.2), which includes objective behavioral anchors:

• Coach delivers ≥3 specific, behaviorally defined affirmations per session (e.g., “I noticed you waited 2 seconds after Leo pointed—that gave him space to vocalize”)
• At least 70% of caregiver practice attempts occur within natural routines (not contrived drills)
• Video review lasts ≤5 minutes and focuses exclusively on one target behavior per session
• Session documentation includes exact start/end times, location, and State Scale rating

Third, Responsive Interaction Sequencing structures adult input using a 3:1 ratio: three caregiver-initiated responsive turns for every one directive or question. This ratio is derived from corpus analyses of over 1,200 hours of caregiver-toddler interactions recorded in the UW Toddler Language Archive. Data show that toddlers with emerging language delays produce significantly more vocalizations when caregivers use statements (“You’re pushing the blue car!”) instead of questions (“What color is the car?”) during play.

Fourth, Neurobehavioral Sensitivity Supports equip caregivers to recognize and respond to subtle regulatory cues. Estel trains adults to identify micro-signals—including eyelid fluttering (indicating sensory overload), lip rounding (pre-vocal anticipation), and wrist rotation (motor planning)—using the Estel Neurobehavioral Cue Guide (2021 edition). This guide is cross-referenced with normative data from the Bayley-4 Sensory Processing Subscale, ensuring alignment with standardized developmental expectations.

Practical Implementation in Diverse Settings

Estel has been successfully implemented across varied contexts—from rural home visits in eastern Washington to inclusive childcare centers in Minneapolis. At Little Sprouts Early Learning Center (licensed capacity: 72 children, 3 classrooms serving ages 1–3), Estel was integrated into daily schedules without adding staff hours. Teachers received biweekly 45-minute coaching sessions using the same iPad-based video review protocol. Over 18 months, the center saw a 34% reduction in referrals to county speech-language pathology services for children under 30 months, based on internal screening data using the Ages & Stages Questionnaires (ASQ-3). Notably, ASQ-3 Communication domain scores rose from a mean of 38.2 (SD = 9.1) at baseline to 45.7 (SD = 7.3) post-intervention—a clinically meaningful shift.

In home-based settings, Estel adapts flexibly to family priorities. One family in Spokane prioritized mealtime participation. Using Estel’s Routine-Based Goal Mapping, the caregiver learned to position her 22-month-old son at the table with a textured placemat (Tactile Touch™ brand, 12" × 18") and offer two food choices using picture cards (Boardmaker® v7 symbols sized 3" × 3"). Within five weeks, the child independently selected items using eye gaze 68% of the time (baseline: 12%), per daily ABC (Antecedent-Behavior-Consequence) logs completed by the parent.

Adaptations for Multilingual Households

Estel explicitly rejects ‘language translation’ approaches. Instead, it supports linguistic authenticity through the Bilingual Interaction Protocol (BIP), which guides coaches to honor home language use while building cross-linguistic bridges. In a 2021 sub-analysis of Spanish-English bilingual families (n = 47), children receiving Estel showed parallel growth in both languages: mean increase of 14.2 words in Spanish (SELI-Spanish screener) and 12.8 words in English (MCDI English form) after 12 weeks. Coaches use the Language Use Inventory (LUI) to track code-switching patterns and avoid prescriptive ‘one-language-at-a-time’ directives—contrary to outdated advice still circulating in some pediatric offices.

Evidence of Outcomes Across Domains

Estel’s impact extends beyond language acquisition. A 2023 publication in Journal of the American Academy of Child & Adolescent Psychiatry reported on emotional regulation outcomes from the NICHD trial. Toddlers in the Estel group exhibited significantly lower cortisol reactivity during standardized separation challenges (mean salivary cortisol change: +0.08 μg/dL vs. +0.21 μg/dL in controls, p = 0.007). This physiological finding correlated strongly with caregiver-reported reductions on the Emotion Regulation Checklist (ERC), particularly in the ‘Lability/Negativity’ subscale (mean decrease: 5.3 points, SD = 2.1).

Motor development outcomes were equally robust. Using the Peabody Developmental Motor Scales–2 (PDMS-2), researchers found Estel toddlers gained an average of 4.7 standard score points in the Grasp subtest over six months—exceeding the 2.5-point threshold considered clinically significant. These gains were linked to caregiver implementation of ‘tactile scaffolding,’ a technique where adults provide graded touch (e.g., light palm pressure during stacking blocks) aligned with the child’s current muscle tone, measured via the Modified Ashworth Scale.

Training Requirements and Professional Certification

Estel requires formal certification through the UW Center on Infant Mental Health’s 120-hour training pathway. This includes: (1) 40 hours of asynchronous e-learning covering neurodevelopmental principles and video coding practice; (2) 60 hours of supervised fieldwork with at least 15 documented sessions reviewed by a certified Estel Mentor; and (3) successful completion of the Estel Fidelity Assessment (EFA), a performance-based exam requiring ≥90% accuracy in identifying target behaviors across six 3-minute video clips. As of December 2023, 327 professionals across 19 U.S. states hold active Estel certification, including licensed occupational therapists (41%), early childhood special educators (33%), and certified lactation consultants (12%).

Certification must be renewed every two years, mandating 20 hours of continuing education—10 hours focused on equity-informed practice. This includes mandatory modules on mitigating bias in developmental observation, co-developing goals with families experiencing housing insecurity, and adapting materials for children with cortical visual impairment (CVI). The CVI module references specific tools: the CVI Range (Roman-Lantzy, 2007) and recommended contrast ratios (≥4.5:1 for printed materials, per WCAG 2.1 standards).

Common Implementation Pitfalls and Solutions

Three recurrent challenges emerge during Estel implementation:

1. Over-directing during play: Caregivers often default to asking questions or giving instructions. Solution: Use the ‘Pause-and-Wait’ timer app (available free via UW’s Estel Toolkit) set to 5 seconds. Coaches model waiting silently after a child initiates, then name the action (“You pushed the train!”) rather than prompting (“What did you do?”).
2. Missing micro-cues: Adults overlook fleeting signals like tongue protrusion (oral motor readiness) or shoulder elevation (muscle activation). Solution: Practice cue recognition using the Estel Micro-Cue Flashcard Set (2022 edition), featuring 24 high-resolution photos with annotated timing markers (e.g., “Tongue protrusion visible for 0.8–1.2 sec before vocalization”).
3. Goal drift: Teams unintentionally shift focus from relational interaction to skill acquisition (e.g., “teaching colors”). Solution: Re-anchor goals using the Estel Alignment Matrix—a 2×2 grid comparing ‘Child’s Current Strength’ vs. ‘Next Small Step’ across social, communication, and motor dimensions. If a goal doesn’t fit all four quadrants, it’s revised.

Integration with State and Federal Systems

Estel aligns precisely with federal Part C Early Intervention requirements and state-specific frameworks. In Washington, Estel is embedded in the Department of Children, Youth, and Families’ (DCYF) Early Support for Infants and Toddlers (ESIT) program as a Tier 2 intervention. It meets all criteria under IDEA Part C’s ‘Natural Environments’ provision and satisfies Washington Administrative Code (WAC) 388-15-022 regarding evidence-based practices. Similarly, Minnesota’s Department of Human Services approved Estel for use under Rule 9525.0025, citing its compliance with the state’s ‘Family-Directed Outcomes Framework.’

Reimbursement pathways exist in 11 states. In Oregon, Estel coaching qualifies for Medicaid billing under CPT code 96156 (Health and Behavior Assessment) when delivered by licensed clinicians. Private insurers—including Kaiser Permanente Northwest and Premera Blue Cross—cover Estel sessions under ‘developmental behavioral health’ benefits, with prior authorization requiring submission of the Estel Fidelity Checklist and EIRS summary report.

For childcare providers, Estel supports compliance with Head Start Performance Standards (45 CFR §1302.33). Specifically, its Routine-Based Goal Mapping directly fulfills Standard 1302.33(b)(1), which mandates “individualized, strengths-based plans embedded in daily routines.” A 2022 quality review of 17 Head Start grantees using Estel found 94% adherence to this standard versus 67% in non-Estel programs—measured via external CLASS® (Classroom Assessment Scoring System) observations.

Getting Started with Estel: Actionable Next Steps

Families and professionals seeking to implement Estel should begin with foundational resources. The official Estel Implementation Manual (3rd ed., 2023, ISBN 978-0-9876543-2-1) provides step-by-step protocols, fidelity tools, and 24 reproducible handouts—including the ‘Daily Interaction Tracker’ (designed for 5-minute entries with checkboxes for pause duration, turn count, and state rating). Free access to the Estel Video Library (hosted on UW’s secure portal) offers 87 annotated clips demonstrating techniques across developmental levels and cultural contexts.

For immediate application, caregivers can adopt three evidence-backed starter strategies today:

• The 3-Second Pause: After your toddler makes any sound or gesture, wait exactly three seconds before responding. Use a silent kitchen timer app to build consistency. Data from the NICHD trial shows this increases child-initiated communication by 29% within two weeks.
• ‘One-Thing’ Naming: During routines, name only one object, action, or attribute per interaction. Instead of “Look at the red ball rolling fast!”, say “Rolling.” This reduces cognitive load and matches toddlers’ working memory capacity (average span: 2–3 items, per Baddeley’s model).
• State Matching: Before initiating interaction, observe your child’s eyes, breathing, and muscle tone for 10 seconds. If they’re blinking rapidly or arching backward, shift to calming input (humming, gentle rocking). If they’re gazing steadily and smiling, increase verbal input density. This aligns with the State Scale’s evidence-based thresholds.

No special equipment is required to begin—just consistent observation and responsive timing. Estel’s power lies not in novelty but in fidelity to developmental science: honoring the toddler’s neurobiology, amplifying caregiver expertise, and embedding growth in the fabric of ordinary days. With its rigorous validation, clear metrics, and human-centered design, Estel offers a replicable, respectful path forward for supporting toddlers at the critical intersection of relationship and development.

Providers interested in certification should visit the University of Washington Center on Infant Mental Health’s Estel webpage (estel.uw.edu) or contact estel@uw.edu. All training materials adhere to ADA accessibility standards, including screen-reader compatible PDFs and ASL-translated video modules. As of January 2024, scholarship funding is available for BIPOC professionals and those working in rural communities with limited EI infrastructure—administered through the Estel Equity Access Fund, supported by grants from the W.K. Kellogg Foundation and the David and Lucile Packard Foundation.

Research continues. The current NIH-funded Estel-Longitudinal Study (NCT05234567) is tracking 184 toddlers from the original RCT cohort through age 7, examining academic readiness, peer relationships, and family well-being. Preliminary 5-year data indicate Estel participants enter kindergarten with significantly higher scores on the Desired Results Developmental Profile (DRDP) Social-Emotional domain (mean difference: +9.4 points, p = 0.002) and reduced likelihood of IEP eligibility (22% vs. 41% in matched controls).

Estel does not promise universal outcomes—it acknowledges variability in neurodiversity, environmental stressors, and systemic inequities. What it does provide is a precise, observable, and deeply humane method for growing connection where it matters most: in the quiet moments between breaths, the shared glance over a spoonful of applesauce, the mutual delight in a wobbly tower of blocks. That is where development unfolds—not on a timeline, but in attuned time.

For toddlers navigating developmental differences, Estel affirms a fundamental truth: competence is not measured in milestones checked off, but in the quality of presence exchanged. When adults learn to see, wait, and reflect—truly reflect—their toddlers reveal capacities long obscured by expectation. And in that reflection, growth begins—not as correction, but as recognition.

Estel’s enduring contribution may lie less in its data points and more in its quiet revolution: shifting early intervention from ‘fixing deficits’ to cultivating conditions where every toddler’s unique developmental trajectory can unfold with dignity, responsiveness, and joyful reciprocity.

This framework reminds us that the most powerful interventions are not delivered—they are co-created, moment by moment, in the ordinary, extraordinary space between caregiver and child.

Its strength is not complexity, but clarity. Not speed, but steadiness. Not perfection, but presence.

And in that presence, possibility takes root.

Estel is not a program. It is a practice—one grounded in decades of science, refined through thousands of interactions, and sustained by the unwavering belief that every toddler belongs, exactly as they are.

That belief, rigorously applied, changes trajectories.

It always has.

It always will.