Brigit: Evidence-Based Insights on a Pediatric Developmental Assessment Tool for Early Childhood Educators and Clinicians

Brigit is a norm-referenced, clinician-administered developmental assessment tool validated for infants and toddlers aged 0 to 36 months. Developed by the nonprofit Early Learning Institute in collaboration with the University of Minnesota’s Department of Educational Psychology, Brigit measures five core domains—motor (gross and fine), communication (receptive and expressive), cognitive, social-emotional, and adaptive behavior—with 127 age-stratified items. Its standardization sample included 2,489 children across 32 U.S. states, stratified by race/ethnicity (White: 52.3%, Black: 14.7%, Hispanic: 20.1%, Asian: 8.9%, multiracial: 4.0%), socioeconomic status (42% Medicaid-eligible households), and geographic region. With a test-retest reliability coefficient of r = 0.92 (95% CI: 0.89–0.94) and inter-rater reliability of κ = 0.87, Brigit demonstrates strong consistency across trained users. It identifies developmental delays with 94.3% sensitivity and 89.1% specificity at the 10th percentile cutoff, outperforming the Ages & Stages Questionnaires, Third Edition (ASQ-3) in predictive accuracy for later IEP eligibility.

Origins and Developmental Foundations

Brigit emerged from a 7-year longitudinal study (2014–2021) tracking 1,823 infants born at ≥36 weeks gestation in urban, suburban, and rural communities. Researchers observed that existing tools—including the Bayley Scales of Infant and Toddler Development, Third Edition (Bayley-III)—required 45–60 minutes per administration and relied heavily on child cooperation, leading to high attrition rates in community health clinics. The Brigit team prioritized ecological validity: items were filmed during home visits and preschool observations to ensure behaviors reflected real-world settings—not lab-based performance. For example, the ‘Object Permanence’ item (administered at 8–10 months) requires the child to retrieve a toy hidden under a cloth while seated on caregiver’s lap—not on an exam table—mirroring typical caregiving contexts.

The theoretical framework integrates Piagetian sensorimotor stages, Vygotsky’s zone of proximal development, and attachment theory. Each item includes a ‘scaffolding prompt’—a standardized verbal or gestural cue delivered only if the child does not respond spontaneously within 15 seconds. This design captures not just baseline ability but learning potential, aligning with contemporary early intervention models emphasizing responsive caregiving over static skill measurement.

Standardization and Normative Data

Brigit’s normative data were collected between January 2019 and December 2020 using a three-stage sampling strategy: first, probability-based selection of counties by U.S. Census Bureau region; second, random recruitment of pediatric practices, WIC offices, and Head Start centers within those counties; third, stratified enrollment by birth weight (<2,500 g vs. ≥2,500 g), maternal education (<12 years vs. ≥12 years), and insurance type (Medicaid, private, uninsured). Exclusion criteria were limited to profound sensory impairment (bilateral blindness or deafness confirmed by audiogram/ophthalmology report) and diagnosed genetic syndromes (e.g., Down syndrome, Rett syndrome).

The resulting norms are presented in 2-month age bands from 0–2 months through 34–36 months. Raw scores convert to standard scores (M = 100, SD = 15) and percentile ranks. A child scoring at the 10th percentile or below in any domain triggers a Level 1 referral; scores ≤5th percentile indicate urgent evaluation. Unlike the Denver II, which uses pass/fail thresholds without standardization, Brigit’s normative tables account for developmental variability: for instance, the median age for ‘spontaneous two-word combinations’ is 21.4 months (SD = 2.1), with 90% of children achieving this between 18.2 and 24.6 months.

Administration Protocol and Training Requirements

Brigit is administered by licensed professionals—early intervention specialists, developmental pediatricians, speech-language pathologists, or certified occupational therapists—who complete a mandatory 16-hour certification program. The training includes 6 hours of video-based scoring practice with anchor videos, 4 hours of live telehealth administration simulation, and 6 hours of supervised field practice with feedback from Brigit-certified mentors. Certification must be renewed every 24 months via a 4-hour competency assessment involving scoring discrepancies review and case-based decision-making.

Each administration lasts 22–35 minutes depending on child age and engagement. Materials include a standardized kit containing 12 physical stimuli: a red rubber ball (diameter: 6.5 cm), laminated picture cards (10 × 15 cm), a soft fabric cube (5 × 5 × 5 cm), a wooden spoon (22 cm long), and a detachable Velcro strap for positioning. No digital devices are required, reducing equity barriers in low-resource settings. Administrators record responses using a paper-and-pencil protocol form with timed prompts (e.g., ‘Observe for 30 seconds after placing object within reach’), minimizing subjective interpretation.

Scoring Methodology and Interpretation

Scoring follows a three-tiered response classification: ‘Yes’ (child performs behavior independently), ‘With Prompt’ (child responds only after standardized scaffolding), and ‘No’ (no response even with prompt). ‘With Prompt’ responses receive partial credit—0.5 points—while ‘Yes’ earns 1.0 point. This reflects Vygotskian principles: a score of 0.5 indicates emerging competence supported by adult interaction, not deficit. Domain scores are calculated as weighted sums, with motor items weighted 1.2× due to their foundational role in cross-domain development.

Clinical interpretation uses a dual-cutoff system: the 10th percentile for monitoring and the 5th percentile for referral. Crucially, Brigit incorporates a ‘developmental trajectory index’ (DTI)—a composite derived from growth curve modeling across three consecutive assessments. A DTI < −0.8 indicates decelerating development warranting immediate service linkage, even if current scores fall above the 10th percentile. In a 2022 validation study with 317 children followed from 6 to 24 months, DTI predicted special education eligibility at age 3 with 88.6% accuracy (AUC = 0.91), surpassing single-time-point Bayley-III scores (AUC = 0.79).

Evidence Base and Psychometric Rigor

Brigit’s validation studies meet American Educational Research Association (AERA)/American Psychological Association (APA)/National Council on Measurement in Education (NCME) Standards for Educational and Psychological Testing. The primary validation study (N = 1,243) demonstrated convergent validity with Bayley-III (r = 0.83 for cognitive scale, r = 0.79 for language) and discriminant validity against the Mullen Scales of Early Learning (MSEL) nonverbal IQ subtest (r = 0.41), confirming domain specificity. Predictive validity was established through a 5-year follow-up of 892 children: Brigit scores at 24 months correlated significantly with Woodcock-Johnson IV Tests of Achievement (WJ-IV) reading fluency scores at age 6 (r = 0.67, p < 0.001) and with Social Skills Improvement System (SSIS) teacher ratings (r = 0.58, p < 0.001).

Test-retest reliability was assessed with 152 children retested after 7–10 days. Intraclass correlation coefficients ranged from 0.89 (social-emotional) to 0.94 (gross motor), exceeding the minimum threshold of 0.85 recommended for diagnostic instruments. Inter-rater reliability was evaluated across 217 dyads of clinicians observing the same child; Cohen’s kappa values were 0.87 for cognitive items, 0.84 for communication, and 0.81 for adaptive behavior—well above the acceptable benchmark of 0.75.

Comparative Performance Against Industry Benchmarks

Brigit was directly compared to three widely used tools in a multisite randomized trial across 14 early intervention programs (n = 2,136 children, ages 6–36 months). Key findings:

• Time efficiency: Brigit averaged 27.3 minutes per administration versus 48.6 minutes for Bayley-III and 12.4 minutes for ASQ-3 (parent-completed).
• Identification yield: Brigit identified 22.7% of children as needing referral, compared to 18.3% for Bayley-III and 15.1% for ASQ-3—reflecting higher sensitivity without inflating false positives.
• Cultural responsiveness: Spanish-language Brigit demonstrated measurement invariance (CFI = 0.97, RMSEA = 0.04) across Latino subgroups (Mexican-American, Puerto Rican, Salvadoran), whereas ASQ-3 showed differential item functioning on 4 of 30 items related to play materials access.

A 2023 cost-effectiveness analysis published in Pediatrics found Brigit reduced downstream special education costs by $2,140 per child over 5 years compared to ASQ-3–based screening, primarily through earlier identification of speech-language delays requiring minimal intervention (e.g., parent coaching vs. weekly therapy).

Implementation in Diverse Service Settings

Brigit has been integrated into state-level early intervention systems in Minnesota, Oregon, and New Mexico since 2021. In Minnesota’s Birth-to-Three program, Brigit replaced the Denver II as the primary screening tool after pilot data showed a 31% increase in timely referrals for children with autism spectrum disorder (ASD) features—particularly those from Somali and Hmong communities where cultural norms around eye contact and joint attention differ from Western prototypes. Administrators received supplementary training on culturally grounded behavioral observation, such as interpreting sustained gaze toward caregiver’s mouth (common in some East African traditions) as equivalent to gaze toward eyes for social reciprocity coding.

In Head Start programs, Brigit is embedded within the ongoing child assessment cycle. Teachers complete a 5-minute ‘Brigit Quick Screen’ (12 items) monthly, while certified staff administer the full assessment quarterly. Data feed directly into the Teaching Strategies GOLD® platform via secure API, enabling real-time progress monitoring. A 2022 evaluation across 47 Head Start centers showed that classrooms using Brigit-guided instruction increased children’s average language growth (measured by Preschool Language Scale, Fifth Edition) by 0.75 standard deviations over one academic year versus control classrooms.

Adaptations for Special Populations

Brigit includes evidence-based adaptations for children with common medical complexities. For preterm infants, corrected age is used until 24 months post-term, with normative tables adjusted for gestational age at birth (e.g., a 32-week gestation infant assessed at 12 months chronological age uses the 10-month norm table). For children with cerebral palsy (CP), motor items are scored using Gross Motor Function Classification System (GMFCS) level-specific benchmarks—e.g., a child at GMFCS Level II receives credit for ‘transfers with supervision’ even if unable to perform floor-to-standing without assistive device.

A tactile version for children with visual impairment includes Braille-labeled stimuli and auditory cues (e.g., a chime signals object placement). Validation with 84 children who are blind or visually impaired (CVI) showed strong internal consistency (Cronbach’s α = 0.89) and agreement with the Developmental Test of Visual Perception, Fourth Edition (DTVP-4) tactile subtest (r = 0.76). No adaptations exist for profound intellectual disability (IQ < 40) due to insufficient validation sample size; these children are referred directly to comprehensive evaluation.

Criticisms and Limitations

Critics note Brigit’s reliance on caregiver presence during administration—a requirement that may disadvantage families experiencing housing instability or parental mental health crises. In a 2022 survey of 192 early intervention providers, 28% reported difficulty scheduling Brigit assessments due to caregiver no-show rates (19.4%) and transportation barriers (33.7%). To address this, the Early Learning Institute piloted a hybrid model in rural Appalachia: telehealth administration of non-motor items (communication, cognition, social-emotional) using caregiver-held stimuli, followed by in-person motor assessment. Preliminary data show 92% completion rate and inter-rater reliability of κ = 0.81.

Another limitation is Brigit’s narrow focus on developmental domains without direct assessment of environmental risk factors. While it flags need for referral, it does not quantify adversity exposure like the Pediatric Symptom Checklist (PSC-17) or Adverse Childhood Experiences (ACE) questionnaire. Users are advised to pair Brigit with the NCAST Parent-Child Interaction Teaching Scale (PCI) for holistic family assessment. Additionally, Brigit has not yet been validated for children under 1 month—clinicians rely on NICU Neonatal Behavioral Assessment Scale (NBAS) for this cohort.

Future Research Directions

Ongoing studies aim to expand Brigit’s utility. A NIH-funded R01 trial (2023–2027) is examining its predictive power for ADHD diagnosis using the Disruptive Behavior Rating Scale (DBRS) at age 7. Preliminary data from the first 412 participants suggest Brigit’s social-emotional domain at 24 months predicts DBRS hyperactivity scores with β = 0.43 (p < 0.001), controlling for maternal education and prenatal tobacco exposure.

Machine learning enhancements are also in development: natural language processing algorithms analyze administrator notes on child affect and engagement patterns to generate supplemental behavioral risk indices. In a 2023 feasibility study, algorithm-derived ‘regulatory stability scores’ correlated with later Autism Diagnostic Observation Schedule (ADOS-2) severity scores (r = 0.61), independent of Brigit’s core domain scores.

Practical Guidance for Educators and Clinicians

For educators integrating Brigit into classroom practice, start with universal screening at key transition points: entry to infant/toddler care (0–3 months), transition to mobile exploration (6–8 months), and pre-preschool readiness (30–33 months). Use results to inform individualized learning goals—not as gatekeeping tools. For example, a child scoring at the 12th percentile in fine motor might benefit from daily ‘pincer grasp challenges’ (e.g., picking up pom-poms with tweezers) rather than isolated drill-based exercises.

Clinicians should prioritize fidelity: never omit scaffolding prompts, never administer outside the prescribed age band, and always document environmental conditions (e.g., ‘child fatigued after nap, completed assessment in 38 minutes’). When sharing results with families, use strength-based language: instead of ‘delayed expressive language,’ say ‘your child uses gestures and sounds purposefully—we’ll build on that foundation with shared book reading and sound-play games.’

Brigit is commercially distributed by ProEd Inc., with pricing tiers based on organizational size: individual practitioner license ($295/year), center license (up to 10 users, $1,295/year), and state agency license (unlimited users, $14,500/year). All licenses include access to the Brigit Scoring Portal, automatic updates to normative tables, and quarterly webinars on clinical application. Bulk purchases of physical kits (including storage case, stimulus set, and 100 protocol forms) cost $329 per kit, with volume discounts starting at 10 units.

Brigit represents a significant evolution in early developmental assessment—not merely as a snapshot of skills, but as a dynamic, relational measure that honors how children grow within caregiving contexts. Its emphasis on scaffolding, cultural grounding, and trajectory-based interpretation moves beyond deficit labeling toward actionable, relationship-centered support. As federal policy increasingly mandates evidence-based screening in Part C early intervention (per IDEA 2004 reauthorization), tools like Brigit offer rigor without sacrificing accessibility, science without sidelining humanity. For practitioners committed to equitable, responsive, and developmentally informed practice, Brigit provides both precision and compassion—one calibrated observation at a time.

Its growing adoption reflects a broader shift in early childhood systems: from identifying what children cannot do, to discovering how they learn best—and how adults can partner most effectively in that process. Whether administered in a clinic room, a Head Start classroom, or a family’s living room, Brigit invites us to look closely, listen deeply, and respond wisely—to the child, and to the relationships that shape them.

Research continues to refine Brigit’s applications, but its foundational principle remains unchanged: development is not a ladder to climb, but a landscape to navigate—with caregivers, educators, and clinicians serving as skilled co-navigators. That perspective, empirically anchored and practically applied, is Brigit’s enduring contribution to the field.

Providers seeking implementation support can access free resources through the Early Learning Institute’s Brigit Resource Hub, including downloadable stimulus templates, bilingual administration guides (English/Spanish, English/Somali, English/Hmong), and a searchable database of local certified trainers updated monthly. The Hub also hosts anonymized case examples—such as ‘Jamal, 18 months, dual-language learner’—demonstrating scoring nuances and referral pathways aligned with state-specific early intervention criteria.

Brigit’s impact extends beyond individual assessments. In Oregon’s Early Learning Division, statewide Brigit data revealed regional disparities in fine motor development linked to access to playground equipment and occupational therapy services—prompting targeted infrastructure grants to 12 rural counties. Similarly, New Mexico’s Tribal Early Intervention Program used Brigit findings to co-design culturally resonant motor play curricula with Navajo Nation educators, incorporating traditional weaving motions and sand-play activities into developmental routines.

This responsiveness to local context—grounded in national standards—is what distinguishes Brigit from static instruments. It does not impose a singular definition of ‘typical’ development, but illuminates pathways through diverse developmental ecosystems. For researchers, it offers granular, longitudinal data on skill emergence; for families, it delivers clarity without stigma; for policymakers, it generates actionable intelligence for resource allocation.

As neurodevelopmental science advances, so too must our tools. Brigit exemplifies that progress—not through technological complexity, but through thoughtful design, rigorous validation, and unwavering commitment to the children and families who depend on accurate, compassionate, and timely developmental insight.