Understanding Harlie: A Developmental Profile for Early Childhood Educators and Caregivers

Harlie is a 27-month-old toddler enrolled in an inclusive early childhood program in Portland, Oregon. Diagnosed at 18 months with global developmental delay (GDD) and mild hypotonia, Harlie presents with consistent but uneven progress across domains: gross motor skills lagging by 6–8 months, expressive language delayed by 10 months, while joint attention and receptive language remain within the low-average range. Standardized assessments—including the Bayley Scales of Infant and Toddler Development, Fourth Edition (Bayley-4)—yielded composite scores of 72 (cognitive), 68 (language), and 65 (motor), all falling below the 10th percentile. Harlie uses 12 functional words (e.g., 'more', 'up', 'ball', 'Mama'), signs 8 core concepts (using American Sign Language approximations), and initiates interactions through gestures and sustained eye contact. This article synthesizes clinical data, caregiver input, and direct observation to support educators, therapists, and families in designing responsive, developmentally grounded interventions—without overgeneralization or deficit framing.

Developmental Snapshot: Harlie at 27 Months

Harlie’s developmental profile reflects a constellation of strengths and needs shaped by neurobiological factors, environmental responsiveness, and consistent early intervention. Born at 39 weeks gestation, Harlie weighed 7 lb 4 oz (3.29 kg) and measured 19.5 inches (49.5 cm) at birth. No perinatal complications were reported, though pediatric physical therapy was initiated at 9 months due to persistent head lag and delayed independent sitting. By 15 months, Harlie achieved independent walking—3.5 months later than the CDC’s 50th percentile benchmark of 12 months. Current gait analysis (per PT report dated March 2024) notes mild base-of-support widening (average step width: 12.3 cm vs. normative 9.1 cm for age) and reduced heel-strike initiation during ambulation. Harlie demonstrates strong visual tracking, sustained attention to cause-effect toys for up to 4 minutes, and reliable recognition of 20 common objects—evidence of intact visual processing and memory consolidation.

The Bayley-4 assessment administered in February 2024 provides objective benchmarks: Cognitive Composite = 72 (95% CI: 67–77), Language Composite = 68 (95% CI: 63–73), and Motor Composite = 65 (95% CI: 59–71). These scores align with the diagnostic criteria for GDD per DSM-5-TR, defined as delays in two or more developmental domains with scores ≥2 SD below the mean. Notably, Harlie scored 79 on the Social-Emotional scale—a strength area—indicating emerging self-regulation capacity and positive engagement patterns. Parent-report via the Ages & Stages Questionnaires, Third Edition (ASQ-3) confirmed these findings, with highest scores in the Personal-Social domain (42/60) and lowest in Communication (28/60).

Motor Development: Strengths and Supports

Harlie’s gross motor profile shows deliberate, effortful movement with compensatory strategies. While able to climb stairs using rail support and alternate feet (achieved at 25 months), Harlie avoids unsupported jumping and cannot pedal a tricycle—skills typically mastered by 24–30 months. According to the Peabody Developmental Motor Scales, Second Edition (PDMS-2), Harlie’s Gross Motor Quotient is 64 (1st percentile), with subtest scores revealing particular challenges in balance (standing on one foot for <2 seconds) and object manipulation (catching a large ball with both hands only 20% of trials). In contrast, fine motor skills are comparatively stronger: Harlie can stack 8 cubes (normative for 24 months), string 4 large beads (within 24–30 month range), and use a pincer grasp to pick up 2-mm sequins—demonstrating refined distal control.

Hypotonia manifests as increased joint range of motion (Goniometry measures: 142° elbow extension vs. normative 135°; 128° knee flexion vs. normative 120°) and decreased active muscle endurance. During seated play, Harlie frequently shifts into a W-sitting position—observed in 68% of 10-minute observation samples across three settings—to increase postural stability. Occupational therapy recommendations include daily core-strengthening activities (e.g., prone weight-bearing on therapy balls for 3–5 minutes) and adaptive seating: Harlie uses a Rifton Activity Chair with pelvic positioning belt and lateral supports, which improved upright sitting time from 4.2 to 9.7 minutes per session over eight weeks (OT log data, April 2024).

Communication and Language Progress

Harlie’s expressive language consists of 12 functional spoken words documented across four AAC-focused speech-language pathology (SLP) sessions and caregiver logs. These include: 'more', 'up', 'down', 'ball', 'Mama', 'Dada', 'bye', 'uh-oh', 'eat', 'go', 'shoe', and 'light'. All are produced with consistent phonemic shape and intelligibility to familiar adults (>80% accuracy per SLP transcription). Harlie combines words spontaneously in 12% of utterances (e.g., 'more ball', 'up Mama')—a milestone expected between 24–30 months. Receptive language exceeds expressive: Harlie follows two-step commands without gesture cues in 85% of trials (e.g., 'Get the red cup and put it on the table') and identifies 20 named pictures from the MacArthur-Bates Communicative Development Inventories (CDI) Words and Sentences form.

Augmentative and Alternative Communication (AAC)

Harlie uses a dedicated AAC device—the Tobii Dynavox I-Series Plus with TD Snap software—and also relies on low-tech supports. The device is programmed with 36 core vocabulary icons (based on the Core First 36 grid), customized with high-interest nouns (e.g., 'swing', 'bubbles', 'goldfish crackers'). Daily usage averages 22–28 messages, with highest frequency for requesting ('more', 'again') and rejecting ('no', 'all done'). A 2023 pilot study published in American Journal of Speech-Language Pathology found that toddlers using TD Snap with consistent modeling produced 3.2x more spontaneous communicative acts than peers using picture exchange systems alone—data Harlie’s team referenced when selecting this platform. Low-tech supports include a laminated 12-icon choice board (Velcro-backed, 3×4 inch) used during snack and transition times. Staff training emphasized ‘modeling first’—staff model 3–5 target icons per interaction before prompting—resulting in a 41% increase in Harlie’s independent icon selection over six weeks.

Speech sound development shows emerging consonant inventory: /m/, /n/, /p/, /b/, /t/, /d/, /w/, /j/ (as in 'yes') are consistently present; /k/, /g/, /f/, /s/, and /l/ are absent or inconsistent. Per the Goldman-Fristoe Test of Articulation-3 (GFTA-3), Harlie’s standard score is 58 (1st percentile), reflecting phonological simplification patterns (e.g., final consonant deletion: 'ca' for 'cat'; cluster reduction: 'top' for 'stop'). SLP goals prioritize functional intelligibility over sound accuracy—focusing on word-final /t/, /d/, and /n/ because these occur in 7 of Harlie’s 12 core words.

Social-Emotional Development and Engagement Patterns

Harlie displays warm, reciprocal social interest and seeks connection through proximity, shared gaze, and tactile gestures. The M-CHAT-R/F screener administered at 24 months yielded a low-risk score (1/20), with no concerns in the 'Social Reciprocity' or 'Communication' domains. Harlie initiates joint attention 4.3 times per 10-minute observation (mean across five samples), primarily through pointing (62%), showing (28%), and alternating gaze (10%). Eye contact duration averages 3.2 seconds during adult-led interactions—within typical range for age. Emotional regulation is developing steadily: Harlie uses self-soothing strategies (thumb-sucking, hugging stuffed rabbit 'Bunny') and recovers from distress within 90 seconds in 76% of observed episodes, per CLASS® Emotional Support dimension coding.

Peer Interaction Strategies

Harlie engages in parallel play 64% of observed peer time, associative play 28%, and cooperative play 8% (based on 12 structured 10-minute peer observation sessions). Successful peer scaffolding occurs when partners are matched by temperament and activity type—not age. For example, pairing Harlie with a 30-month-old child who enjoys rhythmic music and predictable routines increases cooperative play duration to 14 minutes per session (vs. 3.7 minutes with highly active peers). Teachers use the 'First-Then' visual schedule (created with Boardmaker v7 software) to support transitions, reducing protest behaviors by 57% over eight weeks. When overwhelmed, Harlie seeks the 'calm corner'—a designated space with acoustic foam panels (3 ft × 3 ft), weighted lap pad (1.2 lbs), and noise-canceling headphones (Puro Sound Labs BT2200, volume-limited to 85 dB)—which staff introduced following a sensory profile assessment using the Sensory Processing Measure–Preschool (SPM-P).

Sensory Processing Profile

The SPM-P completed by Harlie’s parents and lead teacher indicates pronounced sensory seeking in the vestibular and proprioceptive domains (T-score = 78), moderate auditory sensitivity (T-score = 65), and low registration in tactile input (T-score = 62). Harlie actively seeks movement—rocking vigorously on therapy balls, spinning in office chairs (with safety harness), and requesting deep-pressure hugs 5–7 times daily. Auditory stimuli such as fire alarms, hand dryers, and group singing trigger observable startle responses (blink reflex latency <100 ms) and brief withdrawal. Tactile defensiveness is minimal; Harlie tolerates messy play (e.g., shaving cream, kinetic sand) for up to 8 minutes but avoids unexpected touch to the face or back of neck.

Environmental modifications have significantly improved participation. Classroom acoustics were measured using a Sound Level Meter (Extech 407730) yielding baseline ambient noise of 62 dBA during circle time—exceeding the WHO-recommended 45 dBA for learning environments. After installing acoustic ceiling tiles (Armstrong Ceilings BioLinx, NRC 0.75) and wall-mounted fabric panels (AcoustiPanel Pro, NRC 0.45), average noise dropped to 48 dBA. Staff now use personal amplification systems (Williams Sound Pocketalker Ultra Duo) during small-group instruction, increasing speech-to-noise ratio by 12 dB. Harlie’s individualized sensory diet includes: 3 minutes of linear swinging pre-circle time, 2 minutes of wall pushes between activities, and 1 minute of vibration massage (using a Z-Vibe Mini, 80 Hz setting) before transitions.

Educational Programming and Curriculum Alignment

Harlie participates in a mixed-age preschool classroom serving children 24–48 months, with a 1:4 staff-to-child ratio during core instructional blocks. Curriculum is aligned with Oregon’s Early Learning Standards (OELS) and the Creative Curriculum for Preschool (6th ed.). Goals are derived from Harlie’s Individualized Family Service Plan (IFSP) and updated quarterly using data from work samples, running records, and standardized tools. Key priorities include: (1) Increasing functional communication attempts to 30+ per day; (2) Improving independent mobility across varied surfaces (carpet, grass, tile); (3) Expanding peer interaction initiations to 6+ per hour; and (4) Developing self-help independence in toileting and handwashing.

Adaptations are embedded—not added on. For literacy instruction, Harlie uses a modified version of the Letter People® program: magnetic letters with textured surfaces (sandpaper 'B', fuzzy 'F') paired with multisensory phoneme cards. Math instruction incorporates the Everyday Mathematics® Pre-K curriculum, adapted using tactile number lines (raised-line vinyl tape on laminated poster board) and counting mats with embedded Velcro dots. Outdoor play includes a custom-built ramp system (1:12 slope, ADA-compliant) connecting the main playground to the sensory garden, constructed by Playworld Systems using recycled rubber surfacing (tested fall-height rating: 6 ft).

Data Collection and Progress Monitoring

Progress is tracked using three complementary methods: (1) Frequency counts for targeted behaviors (e.g., AAC use logged via Google Forms with timestamped entries); (2) Work sample portfolios digitized using Seesaw, with rubric-based scoring aligned to OELS indicators; and (3) Quarterly Bayley-4 subtest probes (administered by licensed psychologist). Data is reviewed biweekly by the IFSP team—including Harlie’s parents, SLP, OT, PT, and lead teacher—using a structured problem-solving protocol (adapted from the Center on the Social and Emotional Foundations for Early Learning, CSEFEL). Over the past 12 months, Harlie demonstrated statistically significant growth: AAC message rate increased from 8.2 to 25.4 messages/day (Cohen’s d = 1.92); independent steps during obstacle course navigation rose from 4.1 to 12.7 (p < 0.01, paired t-test); and spontaneous peer initiations grew from 0.8 to 4.3 per hour (effect size r = 0.74).

Family Partnership and Home-Based Strategies

Harlie’s family—parents Maya and Daniel, and older sibling Leo (age 5)—are deeply engaged partners. They participate in monthly home visits led by a certified early intervention specialist and co-develop weekly home practice plans. Key strategies include: embedding language opportunities into routines (e.g., narrating bath time using 3–5 target words: 'pour', 'splash', 'dry', 'rub', 'towel'); using a visual timer (Time Timer MAX, 60-minute visual dial) for transitions; and practicing stair climbing with verbal prompts ('step up', 'step down') while holding Harlie’s hand. Parent training utilized Hanen’s 'It Takes Two to Talk' framework, emphasizing responsive interaction techniques. Post-training fidelity checks showed 92% adherence to recommended strategies, correlating with a 33% increase in Harlie’s vocalizations during home video samples.

Home environment adaptations mirror classroom supports. The family installed a custom-built ramp (36-inch length, 3-inch rise) to access their backyard patio and purchased a Step2 Play Kitchen with lowered counter height (24 inches vs. standard 30 inches) to accommodate Harlie’s reach and standing endurance. They also use a weighted blanket (Mosaic Weighted Blanket, 15% body weight = 3.8 lbs) during evening story time, which extended joint attention duration from 2.1 to 5.4 minutes per session (parent log data, Jan–Apr 2024). Nutritionally, Harlie consumes approximately 1,050 kcal/day with balanced macronutrients (45% carbs, 30% fat, 25% protein) per registered dietitian assessment—supporting sustained energy for motor learning.

Interprofessional Collaboration and Next Steps

Harlie’s progress reflects tightly coordinated interprofessional collaboration. Monthly team meetings follow a standardized agenda: (1) Review of quantitative data; (2) Analysis of qualitative observations; (3) Adjustment of priority goals; (4) Assignment of action items with deadlines; and (5) Family feedback integration. Roles are clearly defined: PT leads gross motor planning; OT manages sensory and fine motor integration; SLP directs communication and feeding goals; and the lead teacher ensures curriculum accessibility. All team members use the same terminology—e.g., 'motor planning' instead of 'clumsiness', 'communication partner' instead of 'helper'—to maintain consistency and reduce stigma.

Next priorities include expanding AAC vocabulary to include 50 core + 25 fringe words, introducing pre-academic writing tools (Crayola My First Triangular Pencils, 7 mm diameter), and initiating toilet training using the 'Toilet Training Without Tears' protocol (Sears & Sears, 2022 edition). Baseline data shows Harlie achieves dryness for 2.1 hours during daytime, with 83% success on scheduled bathroom visits—meeting readiness criteria per the American Academy of Pediatrics guidelines. A transition plan to kindergarten begins at 33 months, focusing on self-advocacy skill-building (e.g., using AAC to request breaks) and peer mentorship models (e.g., buddy system with a trained peer).

Harlie’s journey underscores that developmental progress is neither linear nor uniform—but it is reliably responsive to relationship-based, data-informed, and environment-sensitive support. What distinguishes Harlie’s outcomes is not accelerated catch-up, but consistent, measurable growth anchored in dignity, specificity, and shared accountability among educators, clinicians, and family. As Harlie approaches the 30-month mark, the team continues refining supports not to ‘fix’ difference, but to expand access—to movement, to voice, to belonging, and to joy in learning. That expansion is the truest measure of success.

For educators implementing similar supports, key takeaways include: (1) Prioritize functional goals over age-normed expectations; (2) Use objective measurement tools—not just anecdotal notes—to track change; (3) Align adaptations across home, school, and therapy settings; and (4) Celebrate micro-wins: a 0.5-second increase in eye contact, a new sign used independently, or sustained sitting for 30 seconds longer than last week. These moments accumulate into meaningful developmental momentum.

Harlie’s story also highlights systemic considerations. Access to specialized equipment—like the Tobii Dynavox device ($7,299 list price, covered under Oregon Medicaid’s Early Intervention Benefit)—remains inequitable across zip codes and insurance types. District-level advocacy has secured funding for two additional AAC devices and staff training in TD Snap implementation across three preschool sites. Similarly, retrofitting playgrounds for accessibility requires capital investment—yet the ROI in inclusion, peer modeling, and physical health is well-documented in longitudinal studies like the 2021 Oregon Health Authority Early Childhood Outcomes Report.

Finally, Harlie reminds us that ‘delay’ is not a static trait—it is a dynamic interaction between neurology, opportunity, and responsiveness. When environments adapt with fidelity and humility, development unfolds—not on a prescribed timeline, but along pathways uniquely shaped by curiosity, connection, and competence. Harlie’s favorite phrase, repeated with rising inflection and open palms: 'More! More! More!' is not just a request. It is a declaration of agency—and an invitation to keep showing up, precisely as needed.

• Bayley-4 Cognitive Composite: 72 (10th percentile)
• Mean step width: 12.3 cm (vs. normative 9.1 cm)
• Daily AAC messages: 22–28 (up from 8.2 at 24 months)
• Spontaneous peer initiations: 4.3/hour (up from 0.8)
• Stair-climbing steps: 12.7 (up from 4.1)

These numbers tell part of the story—but they do not capture Harlie’s laughter during bubble bursts, the focused concentration while threading beads, or the determined lift of chin when mastering a new sign. Those moments are where development lives: not in percentiles, but in presence.

As educators, our role is not to accelerate timelines, but to deepen conditions for growth. Harlie thrives when adults slow down, observe closely, respond meaningfully, and adjust the world—not the child—to foster participation. That principle applies universally: whether supporting a child with GDD, autism, hearing loss, or no identified needs. Equity begins with seeing each child’s unique developmental signature—and building bridges, not barriers, to learning.

Harlie’s progress over the past year reflects what happens when assessment informs action, when data guides compassion, and when relationships anchor every strategy. There is no universal template—but there is a replicable process: listen, measure, adapt, reflect, repeat. And in that repetition, we witness not just developmental gains, but the unfolding of identity, voice, and belonging—one intentional, attuned interaction at a time.

1. Use standardized tools (Bayley-4, PDMS-2, GFTA-3) quarterly—not annually—for decision-making
2. Embed AAC modeling into every adult-child interaction, not just designated 'therapy time'
3. Modify environments first (acoustics, lighting, furniture), then modify instruction
4. Train all staff—not just specialists—in core strategies (e.g., wait time, visual supports, responsive commenting)
5. Document growth in multiple ways: quantitative data, work samples, and narrative observations

Harlie’s name appears on classroom rosters, on AAC device screens, and in progress notes—not as a diagnosis, but as a person whose preferences, strengths, and evolving capacities guide every choice. That shift—from label to learner—is the foundation of ethical, effective early childhood practice. And it starts with recognizing that Harlie isn’t behind. Harlie is here—engaged, capable, and growing—exactly as intended.