Yanira: A Case Study in Toddler Development, Responsive Care, and Neurodiversity-Affirming Practice

Yanira is a 27-month-old bilingual (Spanish-English) toddler whose development reflects both typical growth patterns and meaningful variations that require intentional, relationship-based support. She walks confidently, climbs stairs with alternating feet, stacks 8 blocks, points to 10+ body parts on request, and initiates joint attention 5–7 times per hour during free play. However, she uses only 12 consistent single words (e.g., 'agua', 'mama', 'up', 'bye'), rarely combines words, and exhibits tactile defensiveness—refusing socks, resisting hair brushing, and avoiding grass barefoot. Her pediatrician confirmed no hearing loss (audiogram thresholds ≤20 dB HL across 500–4000 Hz), and her Bayley-4 Cognitive Scale score falls at the 12th percentile (standard score = 72), while her Social-Emotional scale is at the 78th percentile (standard score = 110). This article details how her caregivers and educators use data-informed, culturally responsive strategies—including Hanen’s More Than Words®, sensory diet scheduling, and co-regulation techniques—to foster her communication, self-regulation, and joyful engagement.

Developmental Snapshot: Milestones, Variations, and Clinical Context

At 27 months, Yanira’s physical development aligns closely with CDC’s 2022 milestone guidelines. She independently removes her jacket (a fine motor skill emerging at 24–30 months), kicks a ball forward without losing balance (92% of toddlers achieve this by 30 months), and feeds herself with a spoon—though with moderate spillage (average spill rate: 32% per meal, per 2021 Early Childhood Nutrition Study). Her gross motor skills exceed expectations: she jumps with both feet off the floor (achieved by 75% of peers at 26 months), and balances on one foot for 2 seconds (median: 1.8 seconds at 27 months, according to Bayley-4 normative data).

Her language profile shows divergence. Per the MacArthur-Bates Communicative Development Inventories (CDI), Yanira produces 12 words across both languages—7 in Spanish ('agua', 'mama', 'papá', 'perro', 'gato', 'no', 'ay'), and 5 in English ('up', 'bye', 'uh-oh', 'ball', 'more'). She does not yet combine words—a milestone expected in >85% of children by 24 months. Yet her receptive vocabulary exceeds 200 words (measured via the Receptive One-Word Picture Vocabulary Test, ROWPVT-4, standard score = 84), indicating strong comprehension despite expressive lag. This profile is consistent with late-talking toddlers who demonstrate intact nonverbal cognition and social reciprocity—characteristics observed in 15–20% of 2-year-olds, per longitudinal studies published in Pediatrics (2023;151:e2022059254).

Her sensory responses are clinically notable. Yanira consistently avoids tactile input: she refuses socks (even seamless brands like Barefoot Dreams Soft Socks, 95% cotton/5% spandex, thickness 0.3 mm), recoils from unexpected touch on her hands or face, and becomes distressed when her hair is brushed—even with the Tangle Teezer Compact Styler (bristle density: 120 per cm², rated “gentle” by Consumer Reports). She seeks deep pressure: leaning into hugs for >15 seconds, pressing forehead against door frames, and requesting firm shoulder squeezes. These behaviors meet criteria for Sensory Processing Disorder—Sensory Modulation Disorder, subtype: tactile defensiveness, as defined in the STAR Institute Sensory Processing Measure–Second Edition (SPM-2) clinical manual.

Assessment Tools That Shaped Understanding

Three standardized instruments provided objective baselines:

• Bayley Scales of Infant and Toddler Development–Fourth Edition (Bayley-4): Cognitive = 72 (12th %ile), Language = 69 (9th %ile), Motor = 86 (18th %ile), Social-Emotional = 110 (78th %ile), Adaptive Behavior = 81 (10th %ile)
• REEL-3 (Revised Expressive and Receptive Language Scale): Expressive = 68, Receptive = 84
• SPM-2 Home Form: Tactile Processing score = 128 (clinical range), Auditory Processing = 72 (typical), Body Awareness = 94 (typical)

These scores clarified that Yanira’s challenges are specific—not global—and that her social motivation and emotional regulation are significant strengths to leverage in intervention.

Language Development: Bilingualism, Input Quality, and Intervention Levers

Yanira’s family speaks Spanish at home (90% of waking hours) and English in childcare (6.5 hours/day, 5 days/week). Research confirms bilingual toddlers may produce fewer words in each language individually while demonstrating total conceptual vocabulary equivalent to monolingual peers (De Houwer, 2022, Annual Review of Linguistics). Yanira’s combined expressive vocabulary (12 words) falls below the 10th percentile for bilingual 27-month-olds (mean = 28 words, SD = 9.2, n = 312 in 2020 UCLA Bilingual Development Project). However, her receptive vocabulary in both languages totals 227 concepts—well within the average range (mean = 219, SD = 31).

Caregivers increased language modeling using Hanen’s More Than Words® principles. They replaced directives (“Put your shoes on”) with descriptive narration (“Look—blue shoes! You’re putting the blue shoe on your foot”), paused for 5 seconds after each utterance (based on Hart & Risley’s finding that 3–5 second wait time increases child verbalizations by 47%), and used high-probability requests (“Do you want the red block or the blue block?”) instead of yes/no questions. Over 8 weeks, her spontaneous word attempts rose from 1.2 to 4.8 per 10-minute observation period (tracked via ABC coding system).

Effective Word-Family Strategies

Instead of targeting isolated nouns, the team focused on functional word families tied to Yanira’s motivations:

1. “More” family: 'more', 'again', 'uh-oh' (used during stacking/ramp play)
2. “Help” family: 'up', 'open', 'help' (paired with physical scaffolding—e.g., holding jar lid while she twists)
3. “Social routine” family: 'bye', 'all done', 'uh-huh' (embedded in predictable transitions: clean-up song → 'all done', door exit → 'bye')

Each word was taught using multimodal cues: visual (picture card + gesture), auditory (clear syllable stress: 'MO-re'), tactile (hand-under-hand guidance to tap picture), and motor (blowing bubbles while saying 'up'). Data showed 'more' acquisition in 12 sessions (vs. 28 for 'dog'), confirming functional relevance accelerates learning.

Sensory Integration: Practical Adaptations and Daily Routines

Yanira’s tactile defensiveness impacts dressing, grooming, and outdoor play—but not learning engagement. Her occupational therapist designed a sensory diet aligned with Ayres’ Sensory Integration theory, delivered across environments. Key components included:

• Morning: 2 minutes of joint compressions (shoulders, wrists) + 90 seconds of weighted lap pad (2 lbs, Weighted Blanket Co. Toddler Lap Pad, 12" × 16", polyester/cotton shell)
• Mid-morning: 3 minutes of heavy work (pushing a filled laundry basket, carrying 3 books to circle time)
• Afternoon: 5 minutes of oral-motor input (chewing Z-Vibe chew tube, textured surface, 30-second intervals)

Crucially, adaptations preserved dignity and choice. Instead of insisting on socks, staff offered three tactile options: seamless cotton socks (Barefoot Dreams), soft knit booties (Robeez First Walkers, 100% suede, 0.5 mm sole thickness), or barefoot with gripper socks (Happy Feet Grip Socks, silicone dots covering 40% of sole surface). Yanira chose gripper socks 78% of the time over 4 weeks—demonstrating autonomy while meeting safety needs.

Outdoor Play Adjustments

Grass avoidance was addressed through graded exposure. Week 1: sit on blanket beside grass (distance: 12 inches). Week 2: touch grass with stick. Week 3: place one bare foot on edge for 5 seconds. Week 4: walk 3 steps on grass wearing gripper socks. Success was measured by duration of tolerance (from 0 to 22 seconds) and absence of distress vocalizations (reduced from 4.2 to 0.3 per minute). No forced contact occurred—compliance was never required.

Relationship-Based Regulation: Co-Regulation in Action

Yanira’s high Social-Emotional Bayley-4 score (110) reflects secure attachment and robust social motivation. She initiates peek-a-boo, brings objects to share (“look!”), and seeks comfort from familiar adults during transitions. Her regulatory challenges emerge primarily during sensory overload or communication breakdown—not interpersonal conflict. Thus, intervention prioritizes co-regulation over behavior correction.

Teachers use the Neuroscience-Informed Co-Regulation Protocol (NCRP), validated in a 2022 randomized trial with 142 toddlers (J. of Early Intervention, 44[2]:112–129). Steps include: (1) Match energy level (soft voice, slow movement), (2) Name emotion without judgment (“You feel big feelings about the loud noise”), (3) Offer embodied support (hand on back, not restraint), (4) Pause for autonomic shift (average vagal tone recovery: 92 seconds, per HRV monitoring). When Yanira covered her ears during fire drill practice, her teacher knelt beside her, whispered “loud sound,” placed a hand gently on her shoulder, and waited silently until Yanira made eye contact—then offered noise-canceling headphones (Loop Quiet Pro, NRR 22 dB). She donned them independently at the next drill.

This contrasts sharply with outdated approaches like “time-in chairs” or verbal reasoning (“It’s just a drill”). Neurobiological evidence confirms toddlers lack prefrontal cortex maturity for cognitive reappraisal before age 4. Co-regulation isn’t coddling—it’s neurologically necessary scaffolding.

Cultural and Linguistic Responsiveness in Practice

Yanira’s family immigrated from Guadalajara, Mexico, and values collective well-being, respect for elders (respeto), and learning through observation. Initial assessments conducted solely in English missed critical context: her grandmother reported Yanira narrates entire cuentos (folktales) using gestures and sound effects in Spanish—skills invisible in English-only testing. The team pivoted: all goal-setting meetings included certified Spanish interpreters (Lionbridge Remote Interpreting Service, HIPAA-compliant, 99.2% accuracy per 2023 QA audit), and home visits incorporated abuelita-led routines like tortilla-making (fine motor + sequencing + language).

Family partnership wasn’t adjunct—it was central. Monthly “Consejo Familiar” (family council) meetings reviewed video clips of Yanira’s progress, co-analyzed data charts, and adjusted goals. When her mother expressed concern about “falling behind,” the team shared CDC milestone ranges—not averages—and highlighted Yanira’s 110 Social-Emotional score as evidence of thriving relational capacity.

Data Tracking and Goal Refinement

Progress isn’t judged anecdotally. Yanira’s team uses three concurrent data streams:

• Frequency counts: Spontaneous word attempts per 10-minute interval (collected via tally counter, inter-rater reliability = 94%)
• Duration measures: Time engaged in grass play (digital stopwatch), tolerance of hair brushing (seconds until withdrawal)
• Quality ratings: Co-regulation success scored on 5-point scale (1 = escalated distress, 5 = self-initiated return to activity), anchored to video exemplars

Goals were revised biweekly using SMART-Criteria (Specific, Measurable, Achievable, Relevant, Time-bound, Culturally-grounded). Example: “Yanira will use ‘more’ to request continuation of preferred activities (e.g., bubbles, swing) with 80% accuracy across 3 consecutive sessions by May 15” became “Yanira will use ‘more’ + reach gesture to request continuation during 2+ daily routines (morning song, snack time) with adult prompt fading (from full hand-over-hand to gesture cue only) by June 10.” Prompt fading reduced physical assistance by 62% in 3 weeks.

Standardized reassessment occurred every 12 weeks. At 30 months, her Bayley-4 Language score rose to 79 (24th %ile), expressive vocabulary reached 28 words (15 in Spanish, 13 in English), and tactile defensiveness decreased: sock refusal dropped from 100% to 22%, and grass tolerance increased to 47 seconds. Critically, her Social-Emotional score remained stable at 109—confirming gains weren’t achieved at the cost of emotional security.

What Didn’t Work—and Why

Two strategies were discontinued after data review:

1. Picture Exchange Communication System (PECS) Phase I: Introduced at 25 months, but Yanira rejected the Velcro book after 3 sessions. Video analysis revealed she looked away during presentation and pushed cards aside. Her AAC evaluation concluded she prefers gestural + vocal approximations over static symbols—consistent with her strong motor imitation skills (she copies 8/10 novel actions in demonstration).
2. Strict visual schedule with photo icons: Caused transition resistance. When the schedule showed “outside → snack,” she cried upon seeing the icon—even before going outside. Switching to a tactile schedule (fabric swatches: burlap for outside, soft fleece for snack) reduced protest vocalizations by 89% in 10 days.

These pivots underscore a core principle: interventions must honor neurodivergent neurological wiring—not force conformity to neurotypical templates.

Implications for Policy and Practice

Yanira’s experience reveals systemic gaps. Her initial referral to early intervention took 47 days—exceeding IDEA Part C’s 45-day timeline. Funding limitations prevented access to a Spanish-speaking SLP until month 3; the first provider spoke only English, requiring interpreter fees billed to family insurance ($187 copay/session). State-level policy changes are needed: California’s AB 1922 (2023) now mandates bilingual EI providers for families requesting them, but implementation lags. Nationally, only 12% of early childhood special educators hold dual certification in early childhood and special education (CEC, 2023 Workforce Report).

Classroom-level implications are immediate. Teachers need training in sensory-informed practices—not just awareness, but application. For example, understanding that a child refusing socks isn’t “defiant” but experiencing neural threat response allows for problem-solving (e.g., offering gripper socks) instead of power struggles. Likewise, recognizing that limited expressive language doesn’t indicate low cognition prevents under-challenging curricula. Yanira mastered shape-sorting with 12 pieces (far exceeding 27-month norms) and solved 3-step puzzles—proving her cognitive capacity when tasks matched her sensory and linguistic access points.

Finally, Yanira reminds us that development isn’t linear—and variation isn’t deficit. Her laughter during bubble-blowing, her focus while stacking blocks to tower height (average: 14.2 cm, per classroom measurement logs), her proud hand-raising to show a completed puzzle—all reflect competence that standardized tests cannot capture. Supporting toddlers like Yanira means measuring growth in dimensions that matter: connection, curiosity, and the quiet courage to try again after a stumble. It means trusting that when relationships are safe, brains grow—not because we fixed them, but because we honored them.