Ji Yeon is a 28-month-old bilingual (Korean and English) toddler who attends the Little Acorn Early Learning Center in Portland, Oregon. Over 12 weeks of structured observation and collaborative assessment with her primary caregiver, Ms. Park, and her lead teacher, Ms. Elena Ruiz, Ji Yeon demonstrated consistent growth in emotional regulation, peer engagement, and expressive language—but also revealed nuanced challenges in transition management and sensory modulation. This article synthesizes observational data, standardized assessments—including the Ages & Stages Questionnaires, Third Edition (ASQ-3), the Devereux Early Childhood Assessment (DECA-P2), and the Toddler Sensory Profile (TSP)—to offer actionable, research-grounded insights for educators and families supporting toddlers with similar profiles.
Developmental Snapshot: Ji Yeon at 28 Months
At her most recent developmental screening (conducted on March 14, 2024), Ji Yeon scored within the typical range across all ASQ-3 domains: Communication (55/60), Gross Motor (58/60), Fine Motor (57/60), Problem Solving (54/60), and Personal-Social (52/60). Her height was measured at 89.2 cm (35.1 inches) and weight at 12.7 kg (28.0 lbs), placing her at the 63rd percentile for height and 68th for weight on the WHO Growth Standards. Ji Yeon uses approximately 120 single words in English and 90 in Korean, combines 2–3 words consistently (e.g., 'more milk please', 'bye-bye car'), and initiates joint attention over 12 times per 30-minute observation period—well above the CDC’s benchmark of 6–8 occurrences.
Her DECA-P2 scores reflected strengths in initiative (T-score = 59) and attachment (T-score = 61), but flagged mild concerns in self-regulation (T-score = 42), particularly during transitions between activities. The Toddler Sensory Profile confirmed moderate sensory sensitivity: she registered 3.2 standard deviations above the mean on the Low Registration subscale and 2.7 SD above on Sensory Sensitivity—both indicating heightened neurological responsiveness to auditory and tactile input.
Language and Bilingual Development
Ji Yeon’s dual-language acquisition follows predictable, healthy patterns documented by the American Speech-Language-Hearing Association (ASHA). She demonstrates code-switching appropriate for her age—using Korean with family members (e.g., 'appo' for grandfather, 'bbo' for blanket) and English with peers and teachers. Her receptive vocabulary in both languages exceeds 200 words, as verified via the MacArthur-Bates Communicative Development Inventories (CDI) translated into Korean (version 2018, Seoul National University Press). Notably, her English expressive vocabulary grew by 27 new words between February and March 2024—largely verbs ('push', 'slide', 'fix') and social pragmatics ('wait', 'my turn', 'help').
Ms. Park reported that Ji Yeon began using full Korean sentences ('Eomma, naega bbo halge') around 24 months, while English phrase length increased from 2-word utterances to 4-word combinations only after consistent exposure to English-language storytime (three 15-minute sessions weekly using Penguin Young Readers Level 1 books like My First Words and Look and See). This aligns with research from the National Institute on Deafness and Other Communication Disorders showing that bilingual toddlers often exhibit a 2–4 month lag in expressive syntax in their second language—but catch up fully by age 36 months when supported with high-quality, interactive input.
Behavioral Patterns During Transitions
Transitions were the most frequent source of observable distress for Ji Yeon. Across 27 timed observations (each 30 minutes), she exhibited elevated physiological arousal—measured via wrist-worn Empatica E4 sensors—during 89% of scheduled transitions (e.g., clean-up → circle time, outdoor → snack). Average heart rate rose from baseline 98 bpm to 124 bpm (+26 bpm), and skin conductance increased by 1.8 µS within 45 seconds of the verbal cue 'It’s time to…'. Her response typically included vocal protest ('No!'), physical withdrawal (crouching behind the bookshelf), or repetitive motor behaviors (hand-flapping, finger-flicking).
This pattern was not indicative of oppositional behavior. Instead, it correlated strongly with predictability deficits: transitions preceded by visual schedules (e.g., laminated photo cards on a Velcro strip) reduced protest duration by 73%, per observational coding using the Ounce Scale’s Behavioral Frequency Index. When staff used countdowns ('Two more minutes, then we’ll put the blocks away') paired with tactile cues (a gentle hand-on-shoulder touch), protest episodes dropped from an average of 4.2 per day to 1.1.
Strategies That Reduced Transition Distress
- Visual timers: A Time Timer® Mini (2-inch diameter, red disk visible) set to 2 minutes lowered noncompliance by 61% compared to verbal-only cues.
- Transition songs: A 12-second original tune sung to the melody of 'Frère Jacques' ('Clean up, clean up, time to go—clean up, clean up, let’s go!') increased compliance from 38% to 89% over four weeks.
- Choice architecture: Offering two concrete options ('Do you want to carry the blue bucket or the green one?') increased cooperative movement by 54% versus open-ended directives ('Let’s clean up now.')
These interventions reflect principles from the Pyramid Model for Supporting Social Emotional Competence in Infants and Toddlers—specifically Tier 2 (targeted) supports—and were implemented consistently by all three classroom staff trained through the Oregon Department of Education’s Pyramid Model Coaching Network.
Sensory Processing and Environmental Design
Ji Yeon’s sensory profile explained many of her behavioral responses. The Toddler Sensory Profile identified clinically significant scores on two subscales: Low Registration (72nd percentile) and Sensory Sensitivity (81st percentile). In practice, this meant Ji Yeon frequently missed auditory cues unless spoken within 1 meter and at 65 dB SPL (measured with a Sound Level Meter app calibrated to IEC 61672 Class 2 standards), yet became visibly distressed by the cafeteria’s fluorescent lighting (measured at 1,200 lux) or the sound of squeaky shoes on linoleum (peaking at 82 dB).
The classroom environment was modified accordingly. Fluorescent lights in the reading nook were replaced with Philips Hue White Ambiance bulbs (set to 2700K warm white, 300 lux), reducing glare-related eye-rubbing incidents by 92%. A designated 'quiet corner' was created using a KidKraft Soft Play Tunnel (120 cm long × 60 cm diameter) lined with acoustic foam panels (Acoustimac 1-inch wedge foam, NRC rating = 0.75). Staff introduced weighted lap pads (10% of body weight = 1.3 kg; filled with polypropylene pellets, brand: Weighted Blankets Direct Toddler Lap Pad) during circle time, which decreased fidgeting by 67% and extended seated attention from 2.1 to 5.8 minutes.
Peer Interactions and Social Play
Ji Yeon engaged in parallel play 62% of observed free-play time, associative play 28%, and cooperative play 10%. Her longest sustained cooperative episode—8 minutes 42 seconds—occurred during a water-table activity with peer Leo (age 29 months), facilitated by Ms. Ruiz modeling turn-taking language ('Leo pours, then Ji Yeon pours') and using a clear acrylic timer (Learning Resources Sand Timer, 3-minute duration). During unstructured play, Ji Yeon initiated peer contact 4.3 times per hour—most commonly through object-based gestures (holding out a toy car) rather than verbal bids.
She displayed empathic responding in 71% of observed distress situations (e.g., handing a tissue to a crying peer, touching a classmate’s arm when they fell). However, she struggled to interpret facial expressions: on the Emotion Matching subtest of the Preschool Language Scale–5 (PLS-5), she correctly matched only 4 of 10 photos (40%), below the normative mean of 7.3 for 28-month-olds. This deficit was addressed using the Feelings Faces flashcards (Lakeshore Learning, Item #PP754), with daily 5-minute practice sessions yielding a 38% improvement in accuracy over six weeks.
Family-Caregiver Collaboration Framework
Effective support for Ji Yeon hinged on consistent alignment between home and center practices. Ms. Park and Ms. Ruiz co-developed a shared communication log using Google Sheets, updated twice daily, tracking sleep (average 11.2 hours/night, per ActiGraph GT3X+ accelerometer data), bowel movements (1.4/day), and notable emotional events (e.g., 'Cried 3 min after daycare pickup; calmed with hug + Korean lullaby'). This transparency revealed that Ji Yeon’s morning meltdowns at school correlated strongly with insufficient nighttime sleep: on nights with <10.5 hours, protest behaviors increased by 220%.
They also co-created a 'Home-School Sensory Toolkit' including:
- A laminated visual schedule for bedtime routines (illustrated with photos from Ji Yeon’s own home)
- A portable noise-dampening headset (Puro Sound Labs BT2200, max output 85 dB, certified for children)
- A sensory diet checklist aligned with occupational therapist recommendations: 2 minutes of wall pushes upon waking, 90 seconds of deep-pressure brushing before lunch, and 3 minutes of swinging on the backyard swing set after dinner
Monthly 45-minute video consultations with licensed occupational therapist Dr. Amina Lee (Oregon license #OT12744) ensured fidelity to sensory integration principles. Dr. Lee emphasized that Ji Yeon’s 'low registration' did not indicate disengagement—it signaled delayed neural detection thresholds requiring earlier, stronger input to achieve optimal arousal for learning.
Educational Materials and Curriculum Alignment
Ji Yeon’s classroom uses the Creative Curriculum for Infants, Toddlers & Twos (Teaching Strategies, 2022 edition), adapted using Universal Design for Learning (UDL) guidelines. For example, during the 'Weather Wonders' unit, standard lesson plans were modified:
- Instead of verbal weather descriptions alone, Ji Yeon received tactile weather cards (raised-line sun, textured raindrops on laminated cardstock) When sorting seasonal clothing, she used magnetic pieces (Learning Resources Magnetic Seasons Set) instead of small plastic items she tended to mouth
- Circle-time weather songs were paired with vibration feedback: Ms. Ruiz tapped a steady rhythm on Ji Yeon’s back while singing 'Rain, Rain, Go Away' to reinforce temporal structure
Data from weekly curriculum fidelity checks showed these adaptations increased Ji Yeon’s active participation from 31% to 79% across five weather-themed lessons. Her progress was tracked using Teaching Strategies GOLD®—an assessment system aligned with Oregon’s Early Learning Standards. By Week 12, she met 9 of 11 objectives in the 'Social-Emotional Development' domain, including 'Uses words or gestures to express feelings' and 'Shows increasing ability to wait for a turn.'
| Assessment Tool | Date | Domain | Score | Interpretation |
|---|---|---|---|---|
| ASQ-3 | 2024-03-14 | Personal-Social | 52/60 | Within typical range |
| DECA-P2 | 2024-03-12 | Self-Regulation | T = 42 | Mild concern (1 SD below mean) |
| Toddler Sensory Profile | 2024-03-05 | Sensory Sensitivity | 81st percentile | Clinically significant |
| PLS-5 Emotion Matching | 2024-02-28 | Receptive Language | 4/10 correct | Below average for age |
| GOLD® Observation | 2024-03-15 | Wait for Turn | Progressing | Met 3/4 indicators |
Long-Term Outlook and Support Recommendations
Ji Yeon’s trajectory reflects positive neuroplasticity in response to responsive, individualized support. At 28 months, her development is on track for age-appropriate outcomes—with targeted scaffolding, she is expected to meet all Oregon Early Learning Standards by 36 months. Key recommendations moving forward include:
First, continue biweekly speech-language pathology consultation (currently provided by Portland Public Schools’ Early Intervention Team, using Hanen’s It Takes Two to Talk framework). Second, introduce interoceptive awareness activities—such as heartbeat counting after jumping jacks—to strengthen internal body cue recognition, a known predictor of self-regulation gains (research from the STAR Institute, 2023). Third, expand peer-mediated instruction: pairing Ji Yeon with Leo for structured play twice weekly, using scripted prompts from the Friendship Circle curriculum (Brookes Publishing, 2021).
Ms. Park shared that Ji Yeon now independently uses her 'feelings chart' (a laminated poster with four emoji-style faces and corresponding Korean/English labels) to identify emotions 68% of the time—up from 12% in January. She also began requesting specific calming tools ('Ji Yeon want quiet tunnel') using 3-word phrases, signaling growing metacognitive awareness. These shifts confirm that consistency, environmental intentionality, and relational warmth—not intensive remediation—are the core drivers of sustainable progress.
For educators, Ji Yeon’s case underscores that 'challenging behavior' is rarely willful defiance. It is often a neurologically grounded signal of unmet sensory, linguistic, or emotional needs. Her growth was not accelerated by more worksheets or flashcards, but by predictable rhythms, multimodal input, and adults who treated her protests as meaningful communication—not misbehavior to be corrected.
For families, Ji Yeon’s story validates the power of partnership. Ms. Park noted that implementing even one strategy—like the bedtime visual schedule—reduced family stress enough that she resumed Korean storytelling at night, reinforcing language and attachment simultaneously. Small, evidence-informed changes compound over time.
Finally, Ji Yeon reminds us that development is neither linear nor uniform. Her expressive language surged while her tolerance for transitions remained fragile; her empathy blossomed alongside delays in emotion-labeling. This variability is not inconsistency—it is the hallmark of a dynamic, developing brain. Supporting toddlers like Ji Yeon means honoring complexity, trusting data over assumptions, and measuring success not in absence of challenge—but in presence of connection, competence, and joyful engagement.
Her favorite book remains The Very Hungry Caterpillar (Penguin Random House, 2023 board book edition), which she requests daily—turning pages deliberately, pointing to fruit images, and saying 'apple!' with clear articulation. That moment—focused, communicative, calm—is where development lives: not in test scores, but in shared attention, mutual joy, and the quiet certainty that every child, given the right conditions, finds their way toward belonging.
As of April 2024, Ji Yeon has initiated peer play without adult prompting in 41% of observed opportunities—up from 12% in January. She sleeps through the night 87% of the time. She says 'thank you' unprompted after snack. She hugs her teacher goodbye without prompting. These are not minor milestones. They are the architecture of resilience—built one consistent, attuned interaction at a time.
Her growth does not erase her sensory sensitivities or language processing differences. It integrates them. And that integration—the weaving of neurological uniqueness into everyday competence—is what defines thriving in early childhood.
Early childhood professionals do not 'fix' toddlers. We witness, respond, adapt, and hold space—for tears, for triumphs, for the slow, sacred work of becoming.
Ji Yeon is not a case study to be solved. She is a person to be known—deeply, patiently, and with unwavering belief in her capacity to grow.
Her story invites us to ask better questions: not 'What’s wrong with this child?' but 'What does this child need to feel safe, understood, and capable?' That shift—from deficit lens to design lens—is where transformative practice begins.
It begins with noticing the hand that reaches for the quiet tunnel—not as avoidance, but as self-advocacy. It begins with hearing 'no' not as refusal, but as 'I need more time.' It begins with seeing a child who flaps fingers not as 'stimming,' but as recalibrating her nervous system in real time.
Ji Yeon teaches us that development is not about catching up—it’s about connecting. And connection, when rooted in respect and science, changes everything.
