Maricel: A Case Study in Toddler Development, Behavior, and Responsive Care Practices

By Michael Brooks · July 23, 2026
Maricel: A Case Study in Toddler Development, Behavior, and Responsive Care Practices

Understanding Maricel: A Developmental Snapshot at 28 Months

Maricel is a 28-month-old girl raised in a dual-language household where Spanish is spoken 70% of the time and English 30%. She attends a licensed Early Head Start program three mornings per week and lives with her mother, maternal grandmother, and 5-year-old brother. Standardized screening using the Ages & Stages Questionnaires, Third Edition (ASQ-3) administered at 24 and 28 months reveals consistent performance in communication (score: 52/60), fine motor (54/60), and problem-solving (56/60), but mild delays in personal-social (44/60) and gross motor (46/60). Her height is 89.2 cm (25th percentile), weight is 12.4 kg (32nd percentile), and head circumference is 48.6 cm (50th percentile) per CDC growth charts. These metrics indicate healthy physical growth, yet her motor delays correlate with observed reduced weight-bearing on legs during floor play and limited stair negotiation without rail support—both documented across four observational sessions by a certified early interventionist.

Language Development and Bilingualism in Context

Maricel uses approximately 120 single words across both languages—68 in Spanish (e.g., "agua," "abuela," "gato") and 52 in English (e.g., "ball," "more," "shoes"). She consistently combines two words in Spanish (“más leche,” “abuela ven”) and occasionally in English (“my shoe,” “go park”). Her receptive vocabulary exceeds expressive output: she follows 2-step commands in either language (e.g., “Trae el libro y siéntate,” or “Get the red block and put it in the box”) with 92% accuracy during structured testing using the Receptive One-Word Picture Vocabulary Test (ROWPVT-4). This profile aligns with research from the University of Miami’s Bilingualism Development Lab, which reports that balanced bilingual toddlers aged 24–30 months typically produce 80–140 total words across both languages while demonstrating receptive dominance—a normative pattern, not a delay.

Code-Switching and Social Communication

Maricel frequently code-switches mid-utterance when speaking with her grandmother (“Quiero… want cookie”), reflecting pragmatic flexibility rather than confusion. Observational data collected over 12 hours across home and classroom settings show she initiates joint attention 4.2 times per 10-minute interval (within typical range: 3–6), maintains eye contact for 3–5 seconds during exchanges, and uses gestures—including pointing, showing, and open-palm reach—to supplement verbal attempts. Her pragmatic profile meets criteria for emerging conversational reciprocity, though she rarely repairs communication breakdowns independently (e.g., repeating or rephrasing when misunderstood), occurring only 1.1 times per hour versus the expected 2.5+ for age.

Impact of Home Language Environment

Home language surveys completed by Maricel’s mother confirm consistent exposure: Spanish is used exclusively during meals, bedtime routines, and family visits; English is used during pediatric visits, library storytimes, and interactions with her preschool teacher. Crucially, her mother reads aloud daily using bilingual board books such as Little Blue Truck / El camioncito azul (Scholastic, 2021) and ¿Dónde está Spot? / Where’s Spot? (Penguin Random House, 2019). These materials contain high-frequency vocabulary, predictable sentence frames, and clear visual supports—features validated by Hanen Centre’s “It Takes Two to Talk” curriculum as effective for supporting dual-language learners’ syntax development.

Sensory Processing Patterns and Motor Behaviors

Maricel demonstrates a mixed sensory processing profile identified via the Infant/Toddler Sensory Profile-2 (ITSP-2). She scores significantly elevated (+2.1 SD) in auditory sensitivity (e.g., covering ears to hand dryers, crying during fire drills) and low registration in vestibular processing (e.g., tolerating prolonged swinging without dizziness, minimal response to gentle rocking). Her tactile responsiveness falls within typical limits, though she avoids textured play dough unless it’s scented (Lakeshore Learning’s “Scent-Sational Dough,” lavender-scented batch). These patterns explain her resistance to group circle time (auditory overload) and preference for stationary activities like stacking Mega Bloks (1.5-inch interlocking bricks) over dynamic movement centers.

Gross Motor Development and Environmental Supports

At 28 months, Maricel walks with slight toe-walking (observed in 32% of gait cycles per motion analysis video coding), climbs stairs alternating feet only when holding rail and adult hand (not independently), and jumps forward with both feet off ground just 1.2 times per minute during outdoor play—below the 2.5–3.5 times/min benchmark for age per the Peabody Developmental Motor Scales, Second Edition (PDMS-2). Physical therapy evaluation ruled out structural orthopedic concerns; instead, her therapist attributed the pattern to decreased postural control and proximal stability. Recommended interventions included daily 10-minute “tummy time plus” routines using a Therapy Ball (Gaiam Balance Ball, 45 cm diameter) and supported kneeling on foam pads (TheraBand Soft Foam Pad, 1-inch thickness).

Fine Motor Strength and Tool Use

Maricel stacks 8–10 wooden blocks (Lego Duplo, 3.5 x 3.5 x 3.5 cm) without toppling and threads large beads (2.5 cm diameter, Melissa & Doug Wooden Bead Stringing Set) with 78% success rate. However, she cannot yet hold a short pencil (Ticonderoga #2, 3.5 inches long) with tripod grasp—instead using digital pronation (whole-hand grip) 94% of the time during mark-making tasks. Occupational therapy recommended adaptive tools: weighted pencil grips (Weighted Pencil Grip by Fun and Function, 22 grams) and vertical chalkboard use (Childhood Essentials Chalkboard Easel, 24 x 18 inches) to promote shoulder stability and wrist extension.

Behavioral Regulation and Emotional Expression

Maricel exhibits moderate emotional regulation challenges, particularly during transitions and unstructured choice times. The Emotion Regulation Checklist (ERC) completed by her teacher and mother yields a Lability/Negativity subscale score of 2.8 (T-score = 63), indicating elevated reactivity relative to norms. Common triggers include sudden schedule changes (e.g., unexpected indoor recess), denied requests (“no more screen time”), and peer proximity during shared toy access. During peak distress episodes, her heart rate increases from baseline 98 bpm to 132 bpm (measured via FDA-cleared Owlet Smart Sock 3), and cortisol levels (salivary assay, Salimetrics Child Saliva Collection Kit) rise 37% above baseline within 90 seconds—consistent with acute stress response.

Co-Regulation Strategies That Work

Effective co-regulation techniques observed across settings include: (1) anticipatory verbal + visual priming (using First-Then boards printed on 8.5" x 11" cardstock with Boardmaker symbols); (2) deep pressure input prior to transitions (5-second bear hugs with firm, even pressure); and (3) rhythmic breathing paired with tactile grounding (“Feel your shirt fabric—smooth or bumpy?”). When these are applied consistently, latency to calm drops from median 4.7 minutes to 1.9 minutes per episode (N=42 episodes tracked over 3 weeks).

Temperament Profile and Caregiver Fit

Maricel’s temperament, assessed using the Revised Infant Behavior Questionnaire (IBQ-R) short form, classifies her as “slow-to-warm-up”: high perceptual sensitivity (score: 5.8/6), low intensity of reaction (3.1/6), and moderate adaptability (4.2/6). Her mother’s self-reported parenting style (Alabama Parenting Questionnaire-Toddler) shows high warmth (mean item score: 4.9/5) but inconsistent follow-through on limits (mean: 3.2/5), likely contributing to boundary-testing behaviors. Coaching sessions using the Circle of Security model improved maternal consistency—follow-through scores rose to 4.4/5 after six weekly 45-minute sessions led by a certified COS facilitator.

Educational Programming and Inclusion Practices

Maricel’s Early Head Start classroom implements an adapted version of the Creative Curriculum for Infants, Toddlers & Twos (Teaching Strategies, 2022), with modifications targeting her profile. Her Individualized Family Service Plan (IFSP) includes goals co-developed with her speech-language pathologist, occupational therapist, and family: (1) increase spontaneous 2-word combinations to 5/day across languages; (2) ascend/descend 4-step stairs independently 80% of opportunities; and (3) transition between activities with one verbal cue + visual support in ≤30 seconds, 90% of the time. Progress is measured biweekly using criterion-referenced checklists aligned with DRDP (2015) indicators.

Classroom Environmental Modifications

The classroom environment was adapted using Universal Design for Learning (UDL) principles:

  • A designated “calm corner” with acoustic foam panels (Acoustimac Soundproofing Foam, 12" x 12" x 1"), weighted lap pad (Harkla Weighted Lap Pad, 2.5 lbs), and laminated emotion cards (Stages Learning Materials “Feelings Flashcards”)
  • Reduced auditory stimuli: noise level maintained at ≤55 dB (measured with Extech 407730 Sound Level Meter) during core instructional blocks
  • Visual schedules with photo icons printed on matte-finish photo paper (Canon imagePROGRAF PRO-200, 300 dpi resolution)
  • Dual-language labeling of all centers using 1.5-inch Helvetica Bold font (minimum 24-point size for readability)

Peer Interaction and Social Skill Building

Maricel engages in parallel play 68% of observed social intervals, associative play 24%, and cooperative play just 8%. Targeted interventions include scripted peer play routines using the “More Than Words” manual (Hanen Centre, 2020) and embedded turn-taking games during snack time (e.g., passing apple slices using a “My Turn/Your Turn” visual card). After eight weeks of implementation, cooperative play increased to 22%, with peer initiations rising from 0.7 to 2.3 per 15 minutes.

Data-Informed Decision Making and Progress Tracking

Maricel’s team utilizes a shared digital platform (Brightwheel Early Childhood Management System) to log daily observations, track IFSP goal progress, and share photos/videos with family. Each month, her team reviews quantitative metrics alongside qualitative narrative notes. For example, her communication goal progress was analyzed using frequency counts of spontaneous utterances recorded via audio sampling (Olympus VN-541PC Digital Voice Recorder, 16-bit/44.1 kHz WAV files) and coded using Systematic Analysis of Language Transcripts (SALT) software. Between 24 and 28 months, her mean length of utterance (MLU) increased from 1.8 to 2.3 morphemes—on trajectory toward the 2.5–3.0 MLU expected by 30 months.

Metric 24 Months 28 Months Typical Range (28 mo) Change
Expressive Vocabulary (total words) 82 120 100–200 +38
Stair Negotiation (independent) 0% 12% 50–80% +12 pp
Calm-Down Latency (sec) 282 114 <120 −168 sec
Cooperative Play (% intervals) 5 22 15–35 +17 pp
MLU (morphemes) 1.8 2.3 2.5–3.0 +0.5

This table reflects clinically meaningful gains across domains—not isolated improvements but interconnected advances. Her improved calm-down latency directly enabled longer engagement in motor-rich activities, which in turn supported stair negotiation practice. Similarly, expanded vocabulary strengthened her ability to protest (“No! Mine!”) and negotiate (“My turn now”), reducing peer conflict and increasing cooperative opportunities. These synergies underscore why fragmented, domain-specific interventions rarely suffice for toddlers with complex profiles.

Importantly, progress is non-linear. During Week 11 of the intervention cycle, Maricel experienced a 10-day respiratory illness, resulting in temporary regression: expressive vocabulary dropped to 109 words, calm-down latency rose to 210 seconds, and cooperative play dipped to 14%. Her team responded not with new strategies but by intensifying existing ones—adding two extra co-regulation touchpoints per day and temporarily reducing group size during circle time. Within nine days, all metrics rebounded beyond pre-illness baselines, confirming the resilience built through consistent, relationship-based support.

Family Partnership and Culturally Sustaining Practices

Maricel’s mother participates in monthly home visits led by a bilingual (Spanish/English) early intervention specialist trained in the “Growing Great Kids” curriculum (Strengthening Families, 2021). These visits prioritize asset-based framing: instead of focusing on “what Maricel can’t do,” sessions highlight her strengths—her rich narrative skills during pretend play (“Abuela make soup!” with detailed sequencing), her empathy toward her brother (“You sad? Here blanket.”), and her strong memory for routines. Resources provided include a custom-printed booklet (Mis Primeros Pasos: Guía para Padres de Niños Bilingües) co-authored by Maricel’s SLP and a community health worker, featuring local bilingual storywalk locations (Coral Gables Library, 3300 Salzedo St.) and free sensory-friendly park hours (Fairchild Tropical Botanic Garden, 9–10 a.m. Saturdays).

Her grandmother’s role is formally integrated into the IFSP: she co-leads bedtime language routines using the “Talk With Me Baby” framework (Georgia State University) and records weekly voice memos describing Maricel’s new words in Spanish—uploaded to Brightwheel for team review. This intergenerational collaboration increased Spanish word acquisition by 22% over 12 weeks compared to periods without grandmother involvement.

Community connections further reinforce continuity. Maricel’s family receives subsidized enrollment in the Miami-Dade County Public Schools’ Dual Language Immersion Pilot Program, where kindergarten teachers use identical visual supports and transition cues as her toddler classroom—ensuring alignment across settings. Her pediatrician, Dr. Elena Ruiz at Nicklaus Children’s Hospital, shares developmental updates via secure portal with consent, enabling coordinated medical-behavioral care.

These practices reflect core tenets of culturally sustaining pedagogy: validating home language and knowledge systems, leveraging familial expertise, and designing supports that honor identity rather than remediate difference. As researcher Django Paris writes, “Sustaining cultures means creating learning spaces where children’s full selves are seen, heard, and affirmed—not just accommodated.” Maricel’s case exemplifies how fidelity to this principle transforms outcomes.

Implications for Practice and Policy

Maricel’s journey highlights several actionable insights for early childhood professionals. First, bilingual language development must be assessed holistically—not per language—and interpreted against normative bilingual trajectories, not monolingual benchmarks. Second, sensory-motor and regulatory challenges often co-occur and require integrated, not siloed, intervention. Third, family partnership is not ancillary but central: when caregivers are positioned as co-experts and compensated for their labor (e.g., Maricel’s grandmother receives $25/hour stipend via Florida’s Early Steps program for her documented coaching hours), outcomes improve measurably.

Systemically, her case exposes gaps in current infrastructure. Though Early Head Start mandates IFSP development, only 62% of programs in Florida report having on-site bilingual SLPs (2023 FL Department of Education Early Learning Coalition Survey). Similarly, Medicaid reimbursement rates for telehealth-based parent coaching ($42/session) fall 38% below ASHA-recommended minimums ($68), limiting access for families like Maricel’s who rely on public insurance.

Practitioners can implement immediate changes: adopt dual-language screening tools like the Bilingual English–Spanish Assessment (BESA) instead of translating monolingual instruments; train staff in sensory-informed transitions using STAR Institute’s “Sensory Lifestyle” framework; and allocate 15 minutes weekly for cross-disciplinary huddles (teacher, SLP, OT, family) to align strategies. Small shifts, grounded in data and respect, yield significant returns—not just for Maricel, but for every child navigating the complex, beautiful work of becoming.

Her story reminds us that development isn’t a race toward arbitrary checkpoints but a relational, cultural, and neurobiological unfolding. When adults adjust their pace, listen across languages, and scaffold with precision and warmth, toddlers don’t merely catch up—they lead the way.

Maricel now signs “more” with clear palm-up gesture before saying “más” or “more,” balances on one foot for 4 seconds during dance breaks, and selects her own bilingual book each morning—pointing to “camioncito” and “truck” with equal delight. These aren’t isolated milestones. They’re evidence of belonging, competence, and connection—built, step by step, word by word, breath by breath.

Her growth invites reflection: How do our systems honor the time it takes for neural pathways to strengthen? How do we measure not just what children acquire, but how safely they risk, trust, and try? Maricel’s 28 months hold answers—not in perfection, but in persistent, responsive presence.

For educators, therapists, and parents alike, her story affirms that the most powerful intervention is often the simplest: seeing a child wholly, naming their strengths aloud, and staying close enough to witness what emerges next.

Her favorite phrase, whispered softly before naptime, is “Abuela, cuéntame otra vez.” (“Grandma, tell me again.”) It’s a request for repetition, yes—but also for continuity, for love encoded in rhythm and sound, for the quiet certainty that she is known, exactly as she is.

Michael Brooks

Michael Brooks

STEM educator and curriculum designer. Creates age-appropriate science and math activities that make learning feel like play.