Natalie Perez: Evidence-Based Strategies for Supporting Toddlers with Intense Emotional Expression and Sensory Processing Differences

Natalie Perez is a licensed occupational therapist and early childhood behavior consultant whose work has transformed how educators understand and support toddlers with intense emotional expression and co-occurring sensory processing differences. Over the past 12 years, she has trained over 4,200 educators across 27 U.S. states and Canada, refining interventions grounded in neuroscience, attachment theory, and developmental-behavioral pedagogy. Her approach prioritizes co-regulation over compliance, uses measurable physiological markers (e.g., heart rate variability shifts within 90 seconds of intervention), and integrates validated tools like the Sensory Processing Measure–Preschool (SPM-P) and the Emotion Regulation Checklist (ERC). This article details her core strategies—including the 3-Step Reset Protocol, sensory diet mapping, and caregiver-responsive scaffolding—with concrete examples, fidelity data from Head Start sites in Austin and Portland, and actionable takeaways for classrooms serving children aged 18–36 months.

Who Is Natalie Perez—and Why Her Framework Resonates in Early Childhood Settings

Natalie Perez earned her Master of Science in Occupational Therapy from Columbia University in 2011 and completed postgraduate certification in infant and early childhood mental health through the Michigan Association for Infant Mental Health. She founded the nonprofit Growing Roots Collaborative in 2015 to bridge clinical expertise with frontline educator practice. Unlike traditional behavioral models that rely on external rewards or time-based consequences, Perez’s methodology centers neurobiological readiness: she asserts that regulation must precede learning, and that tantrums, withdrawal, or aggression in toddlers aged 2–3 are not willful defiance but signals of overwhelmed autonomic nervous systems. Her 2022 randomized controlled trial published in Early Childhood Research Quarterly demonstrated a 41% average reduction in daily escalation episodes among toddlers using her co-regulation protocol versus standard care—measured via direct observation coding across 12 Head Start classrooms over 16 weeks.

Perez’s influence extends beyond research. She co-developed the Regulatory Readiness Screen (RRS), a 10-item observational tool now adopted by 112 state-funded early intervention programs, including California’s Early Start and New York’s CPSE. The RRS tracks observable markers such as sustained eye contact duration (baseline median: 2.3 seconds; post-intervention median: 5.7 seconds), transition latency (average time to shift activities without protest: 12.4 seconds pre- vs. 6.1 seconds post-protocol), and vocal prosody stability (assessed using Praat acoustic analysis software). These metrics allow educators to move beyond subjective labels like “difficult” or “spirited” and instead track objective, developmentally appropriate progress.

The Neurodevelopmental Foundation: Why Toddlers’ Brains Need Co-Regulation First

The toddler brain—from 18 to 36 months—is undergoing explosive growth in the prefrontal cortex, yet this region remains structurally immature. Functional MRI studies confirm that executive function networks are only 25–35% myelinated at age two and reach ~65% myelination by age four. Simultaneously, the amygdala—the brain’s threat-detection center—is highly active and metabolically dominant. When sensory input exceeds capacity (e.g., fluorescent lighting at 5,000 lux, background noise exceeding 65 dB in a typical preschool classroom), the sympathetic nervous system triggers fight-flight-freeze responses before higher-order thinking can intervene. Perez emphasizes that expecting a 27-month-old to “use their words” during meltdown onset is neurologically implausible—it’s like asking someone to recite poetry while choking.

Autonomic Nervous System Literacy for Educators

Perez trains educators to recognize three primary autonomic states—not just ‘calm’ or ‘upset.’ These include:

• Ventral Vagal State: Characterized by open posture, reciprocal eye contact, modulated voice, and willingness to engage. Baseline HRV (heart rate variability) in this state averages 58–72 ms (measured via Polar H10 chest strap in validation studies).
• High-Arousal Sympathetic State: Manifested as rapid breathing, flushed skin, clenched fists, and high-pitched vocalizations. HRV drops to 18–32 ms; cortisol levels spike 300–450% above baseline within 45 seconds.
• Low-Arousal Dorsal Vagal State: Seen as withdrawal, blank facial expression, reduced movement, and unresponsiveness. HRV falls below 12 ms; parasympathetic dominance suppresses engagement capacity.

Her training teaches staff to assess state *before* responding—never assuming agitation equals anger, nor stillness equals compliance. In one Portland Public Schools pilot, teachers who received 8 hours of Perez-led ANS literacy training increased accurate state identification from 43% to 89% within six weeks, verified by blinded video coding.

The 3-Step Reset Protocol: A Step-by-Step Intervention Sequence

Perez’s signature 3-Step Reset Protocol is designed for use within 60 seconds of dysregulation onset and requires no materials. It is not a ‘trick’—it’s a scaffolded return to physiological safety. Each step aligns with Polyvagal Theory principles and is timed to match documented neurobiological response windows.

Step 1: Proximity & Posture (0–15 seconds)

Educators kneel or sit beside—not in front of—the child, lowering their center of gravity to reduce perceived threat. They orient their shoulders slightly away (reducing frontal confrontation) and soften their gaze. No verbal input occurs here. This step leverages social engagement cues: eye-level positioning increases oxytocin release by ~22% (per salivary assay data in Perez’s 2021 pilot), while non-confrontational posture decreases amygdala activation measured via fNIRS. In 94% of observed resets, children shifted from dorsal vagal withdrawal to orienting behavior (e.g., turning head toward adult) within 12 seconds when posture was correctly applied.

Step 2: Co-Breathing & Rhythm (15–45 seconds)

Once the child begins to orient—even subtly—the educator gently models slow, audible diaphragmatic breathing (inhale 4 sec / hold 2 sec / exhale 6 sec). They may tap a steady rhythm on their own thigh (60 bpm, matching resting heart rate) or hum a low, resonant tone (C2 at 65 Hz). This entrains the child’s respiratory and cardiac rhythms via auditory-motor coupling. A 2023 study in Journal of Child Psychology and Psychiatry confirmed that rhythmic auditory input at 60–65 bpm increased HRV coherence by 37% in toddlers aged 24–30 months compared to silence or variable tempo.

Step 3: Choice Anchoring (45–60 seconds)

Only after observable signs of ventral vagal return—such as relaxed jaw, blinking, or reaching out—is a simple, concrete choice offered: “Do you want the blue blanket or the green one?” or “Shall we walk to the sink or hop there?” This restores agency without cognitive overload. Choices are always physical, binary, and immediately executable. In Perez’s longitudinal cohort (n=217 toddlers), 78% accepted an anchoring choice within 60 seconds of Step 1 initiation—compared to 29% in control groups using verbal reasoning first.

Sensory Diet Mapping: Moving Beyond ‘Sensory Bins’

Perez critiques the oversimplification of sensory integration as ‘play with rice or playdough.’ Instead, she advocates for individualized sensory diet mapping—a proactive, hourly schedule of targeted input calibrated to each child’s neurological thresholds. Using data from the SPM-P (standardized scores ≥1.5 SD above mean indicate hypersensitivity), her team identifies which sensory channels require modulation: vestibular (movement), proprioceptive (body awareness), tactile (touch), auditory, or visual.

For example, a 32-month-old named Leo scored 84 on the SPM-P Tactile Sensitivity subscale (clinical cutoff = 78), indicating extreme discomfort with unexpected touch. His mapped sensory diet included:

1. Proprioceptive input every 90 minutes: 3 minutes of wall pushes (15 lbs resistance using TheraBand Blue bands) or bear crawls across 10 ft of carpeted floor.
2. Vestibular input twice daily: 90 seconds on a SitFit Balance Disc (inflated to 8 psi) during circle time.
3. Auditory regulation: Noise-canceling headphones (Bose QuietComfort Earbuds, ANC mode active) available at all times; ambient classroom noise maintained at ≤52 dB (measured with SoundMeter Pro app).

After eight weeks of fidelity-checked implementation, Leo’s tactile avoidance behaviors decreased from 17 incidents/day (observed baseline) to 2.3 incidents/day—a 86% reduction. His teachers reported improved participation in handwashing (from 0% compliance to 92%) and peer proximity during snack (median distance reduced from 48 inches to 18 inches).

Partnering With Families: The Caregiver-Responsive Scaffolding Model

Perez insists that school-based strategies fail without alignment at home. Her Caregiver-Responsive Scaffolding Model trains families—not to replicate classroom techniques—but to embed regulation into daily routines using their unique cultural practices and resources. In her Austin-based pilot with Spanish-speaking families (n=83), bilingual home visitors coached parents to identify naturally occurring co-regulation moments: rocking while singing lullabies, carrying infants in woven slings (Mayan or Ergobaby carriers), or pausing mid-sentence during storytime to observe breath patterns.

Key fidelity metrics tracked included:

• Consistency of predictable transitions (e.g., same 3-step warning before diaper change: “First we wipe, then we pull up pants, then we read one book”).
• Use of ‘body-first’ language (“I see your hands are wiggling—let’s squeeze this stress ball together”) instead of ‘mind-first’ directives (“Stop wiggling!”).
• Frequency of caregiver self-regulation modeling (e.g., parent taking 3 visible breaths before responding to child’s frustration).

After 12 weeks, families averaged 4.2 co-regulation opportunities per day (SD = 0.7), up from 1.1 at baseline. Child-initiated joint attention episodes increased from 1.8 to 5.4 per hour—validated by independent ADOS-2 scoring.

Classroom Environment Design: Data-Driven Modifications That Matter

Perez’s environmental recommendations are precise and quantifiable—not aesthetic preferences. She cites specific decibel levels, light wavelengths, and spatial configurations backed by occupational therapy and environmental psychology literature. Below is a summary of evidence-based modifications implemented in her certified ‘Regulation-Ready Classrooms’:

These specifications are not theoretical ideals—they reflect minimum thresholds required to prevent sensory gating failure in neurodivergent toddlers. For instance, Perez’s team found that exposure to >60 dB for more than 9 minutes triggered measurable cortisol elevation in 83% of toddlers with SPM-P auditory sensitivity scores ≥75. Similarly, lighting above 4,000K correlated with 3.2x more frequent blinking and aversion behaviors during book-sharing sessions.

Measuring Progress Without Pathologizing Development

Perez rejects deficit-based progress tracking. Her assessment framework focuses on functional gains tied to developmental milestones—not symptom reduction. She uses three primary metrics:

1. Regulatory Capacity Index (RCI)

A composite score derived from five observable indicators collected weekly: latency to recover from upset (target: ≤90 sec), duration of sustained joint attention (target: ≥3 min), frequency of self-initiated calming (e.g., seeking weighted lap pad), consistency of sleep-wake rhythm (measured via parent log), and diversity of food textures accepted (using Food Texture Acceptance Scale). In her statewide Illinois rollout, RCI scores increased by an average of 2.4 points (out of 10) per month across 214 toddlers—significantly exceeding normative gains of 1.1 points/month.

2. Caregiver Stress Index (CSI) Reduction

Perez monitors adult well-being as a critical outcome. She administers the Parenting Stress Index–Short Form (PSI-SF) biweekly. In her Denver Head Start collaboration, staff CSI scores dropped from a mean of 82.4 (clinically elevated) to 61.2 (within normal range) after implementing her team-coaching model—correlating with 32% fewer staff-reported burnout symptoms.

3. Peer Interaction Quality Score (PIQS)

Using the Peer Play Scale (PPS), observers code interactions for reciprocity, shared affect, and repair attempts—not just proximity or toy sharing. After six months of Perez-aligned programming, toddlers showed a 4.7-point average PIQS gain (scale 0–20), with the largest improvements in conflict resolution (e.g., handing back a toy without adult prompting) and mutual laughter episodes.

Importantly, Perez cautions against misinterpreting progress. A child who moves from 20 meltdowns/week to 12 isn’t ‘halfway there’—they’re demonstrating neuroplastic adaptation. Likewise, increased crying during co-regulation isn’t regression; it’s often a sign of nervous system recalibration, validated by concurrent HRV rebound. Her mantra: “Regulation isn’t quiet. It’s safe movement, safe sound, safe tears.”

One final note: Perez’s work does not advocate for universal application of all strategies. She stresses differential responsiveness—what works for a child with high proprioceptive need (e.g., deep pressure) may dysregulate one with tactile defensiveness. Her fidelity checklist includes mandatory weekly review of individual sensory profiles and adjustment of input type, intensity, and timing based on real-time behavioral data—not assumptions.

For educators, the takeaway is both simple and profound: supporting toddlers with intense emotional expression isn’t about fixing them. It’s about redesigning environments, retraining adult nervous systems, and recognizing that every breath, blink, and reach is data—not disruption. As Perez writes in her 2023 practitioner manual: “When we stop asking ‘How do we make this child behave?’ and start asking ‘What does this child’s nervous system need to feel safe enough to grow?’—that’s where development begins.”

Her framework is accessible without certification. Free resources—including the RRS screener, sensory diet template, and Reset Protocol quick-reference card—are available at growingrootscollaborative.org/resources. All materials are translated into Spanish, Vietnamese, and Somali, with audio narrations for low-literacy caregivers.

Since 2018, Perez’s methods have been integrated into the Massachusetts Department of Early Education and Care’s Tiered Supports Framework and cited in the American Occupational Therapy Association’s 2022 Practice Guidelines for Early Intervention. Her upcoming book, Regulation Before Reading: Practical Neuroscience for Toddler Classrooms, releases October 2024 with Redleaf Press.

Real change starts not with grand initiatives—but with kneeling beside a child, matching their breath, and offering one tangible choice. That’s where Natalie Perez’s legacy lives: in the quiet, precise, deeply human moments where safety becomes the curriculum.