The Research, kinder co. PNW
kinder co. PNW
the research.

Every strategy, framework, and resource at kinder co. is grounded in real science. This page is for the parents and professionals who want to go further, to understand the research behind what we teach, and to explore it on their own terms.

kinder co. workshops and resources draw from decades of peer-reviewed research across child development, behavioral science, neuroscience, and education. The frameworks Kristen teaches, Kinder Weather™, Kinder Sleep™, the Potty Talk™ methods, Play with Purpose™, and Kinder Circles™, are each built on a distinct body of evidence, translated into tools families can actually use.

This page organizes those sources by topic area. Where a source is foundational to a specific workshop, it's noted. Where something appears across multiple areas of the work, it's marked as a core reference. All citations are provided in full for parents, educators, and practitioners who want to read further.

This list will grow as new workshops and resources are developed.

core reference area
child development foundations

The developmental science that runs through everything at kinder co., how children grow, how brains form, what caregivers can do during each stage, and why early experience shapes everything that follows. These are the sources behind the Kinder Co. Growth Map and the developmental framing in every workshop.

🧠

Harvard Center on the Developing Child

The primary source for brain architecture, neural connection research, and serve-and-return science used across all kinder co. workshops.

👶

American Academy of Pediatrics (AAP)

Developmental milestone guidance, play-based learning position statements, and early childhood health recommendations.

📐

Jean Piaget, Cognitive Development Theory

Foundational stage theory behind the developmental framing in the Growth Map: sensorimotor, preoperational, concrete operational, and formal operational stages.

🌱

Lev Vygotsky, Zone of Proximal Development

The theoretical basis for scaffolding, the idea that children learn best just beyond their current capacity, with the right support. Foundational to the Kinder at Play approach.

01
Center on the Developing Child, Harvard University
The Science of Early Childhood Development: Closing the Gap Between What We Know and What We Do
developingchild.harvard.edu, 2007 (updated 2016)
Core source for the 90% brain development by age 5 statistic, the 1 million neural connections per second figure, and the serve-and-return interaction model used across all kinder co. frameworks.
all workshops
02
Center on the Developing Child, Harvard University
Building the Brain's "Air Traffic Control" System: How Early Experiences Shape the Development of Executive Function
Working Paper No. 11, developingchild.harvard.edu, 2011
Foundational to the Play with Purpose™ workshop. Establishes executive function, working memory, cognitive flexibility, and inhibitory control, as skills built through play, not direct instruction.
Play with Purpose™
03
Shonkoff, J.P. & Phillips, D.A. (Eds.)
From Neurons to Neighborhoods: The Science of Early Childhood Development
National Academies Press, 2000
Comprehensive synthesis of early childhood development research. Core reference for the developmental stage framing in the Growth Map and the emphasis on early experience in shaping long-term outcomes.
Growth Map
04
American Academy of Pediatrics
The Power of Play: A Pediatric Role in Enhancing Development in Young Children
Pediatrics, Vol. 142, No. 3, 2018
The AAP's official position on play as foundational to development. Source for the characterization of executive function as "the process of how we learn" used in Play with Purpose™.
Play with Purpose™
05
Bronfenbrenner, U.
The Ecology of Human Development: Experiments by Nature and Design
Harvard University Press, 1979
The ecological systems model, the idea that child development happens within nested layers of environment (family, community, culture), informs the whole-family framing at kinder co. and the emphasis on the home environment in Kinder at Play.
all workshops
Kinder Weather™
emotional regulation & co-regulation

The neuroscience and developmental psychology behind Kinder Weather™, the five emotional states framework, the amygdala/prefrontal cortex relationship, co-regulation as a developmental mechanism, and why toddlers literally cannot "just calm down."

01
Siegel, D.J. & Bryson, T.P.
The Whole-Brain Child: 12 Revolutionary Strategies to Nurture Your Child's Developing Mind
Delacorte Press, 2011
The "upstairs/downstairs brain" model, amygdala vs. prefrontal cortex in plain language, is the primary translation framework behind the Kinder Weather™ foundation section. The concept that children cannot integrate their rational and emotional brains in states of high arousal is central to the entire framework.
Kinder Weather™
02
Schore, A.N.
The Science of the Art of Psychotherapy
W.W. Norton & Company, 2012
Foundational neurobiological research on co-regulation, the mechanism by which a regulated caregiver helps a dysregulated child return to calm. The basis for "your calm is not optional, it's the intervention" in Kinder Weather™ and Kinder Sleep™.
Kinder Weather™ Kinder Sleep™
03
Gross, J.J.
Handbook of Emotion Regulation (2nd ed.)
Guilford Press, 2014
Comprehensive framework for understanding emotion regulation across development. Informs the Kinder Weather™ model of moving from co-regulation toward self-regulation, and the concept of regulatory capacity as a learnable skill.
Kinder Weather™
04
Gottman, J.M. & DeClaire, J.
Raising an Emotionally Intelligent Child: The Heart of Parenting
Simon & Schuster, 1997
Emotion coaching, naming feelings before redirecting behavior, is a core Kinder Weather™ strategy directly grounded in Gottman's research. The "name it to tame it" principle comes from this work and is a cornerstone of the Growth Map guidance.
Kinder Weather™ Growth Map
05
LeDoux, J.E.
The Emotional Brain: The Mysterious Underpinnings of Emotional Life
Simon & Schuster, 1996
Seminal neuroscience research on the amygdala's role in threat detection and emotional memory. Foundation for the Kinder Weather™ explanation of why children react before they think, and why that's neurologically normal.
Kinder Weather™
Kinder Sleep™
sleep science & development

The behavioral and developmental science behind Kinder Sleep™, sleep cycles, sleep onset associations, why children wake at night, and how gradual independence is learned rather than forced. These sources underpin the three pillars (predictability, co-regulation, gradual independence) and the Kinder Fade™ method.

01
Mindell, J.A. & Owens, J.A.
A Clinical Guide to Pediatric Sleep: Diagnosis and Management of Sleep Problems (3rd ed.)
Wolters Kluwer, 2015
The primary clinical reference for pediatric sleep. Source for the 45–60 minute sleep cycle biology in young children, sleep onset association theory, and the evidence base for gradual behavioral sleep interventions. Foundational to the Kinder Fade™ framework.
Kinder Sleep™
02
Galland, B.C., Taylor, B.J., Elder, D.E., & Herbison, P.
Normal sleep patterns in infants and children: A systematic review of observational studies
Sleep Medicine Reviews, 16(3), 213–222, 2012
Systematic review establishing normative sleep data across infancy and early childhood. Used in Kinder Sleep™ to contextualize night waking as biologically normal, not a parenting failure, and to set realistic expectations for families.
Kinder Sleep™
03
Ferber, R.
Solve Your Child's Sleep Problems (revised ed.)
Fireside, 2006
Original clinical framework for sleep onset associations and behavioral sleep intervention. The Kinder Fade™ method is informed by, but deliberately modifies, Ferber's graduated extinction approach to reduce cortisol response and preserve the co-regulation relationship.
Kinder Sleep™
04
Price, A.M.H., Wake, M., Ukoumunne, O.C., & Hiscock, H.
Five-Year Follow-up of Harms and Benefits of Behavioral Infant Sleep Intervention: Randomized Trial
Pediatrics, 130(4), 643–651, 2012
Longitudinal study demonstrating no lasting harm from behavioral sleep interventions when implemented appropriately. Used in Kinder Sleep™ to address parent concerns about emotional damage from sleep training and support the safety of the gradual independence approach.
Kinder Sleep™
05
Cooper, J.O., Heron, T.E., & Heward, W.L.
Applied Behavior Analysis (3rd ed.)
Pearson, 2020
The primary behavioral science text behind the stimulus control and operant conditioning principles in Kinder Sleep™. "The routine is the signal" and "the brain learns what to expect" are direct translations of stimulus control and respondent conditioning concepts from this framework.
Kinder Sleep™ Potty Talk™
Potty Talk™ · all workshops
behavioral learning & skill acquisition

The applied behavior analysis and learning theory behind kinder co.'s approach to teaching new skills, task analysis, reinforcement timing, predictable schedules, and the principle that behavior is learned, which means it can be taught. Central to Potty Talk™ and present across all workshops.

01
Skinner, B.F.
The Behavior of Organisms: An Experimental Analysis
Appleton-Century-Crofts, 1938
Foundational operant conditioning research. The principles of reinforcement, that behavior followed immediately by a meaningful consequence is more likely to repeat, underpin the Potty Talk™ intensive method, including the 3–5 second reinforcement delivery window and the use of high-value, immediate rewards during the training weekend.
Potty Talk™
02
Azrin, N.H. & Foxx, R.M.
Toilet Training in Less Than a Day
Simon & Schuster, 1974
Original intensive toilet training research using behavioral principles: increased fluid intake, scheduled interval trips, immediate reinforcement, and task analysis of the toileting sequence. The Potty Talk™ intensive method is directly informed by this work, updated for current developmental science and family context.
Potty Talk™
03
Cooper, J.O., Heron, T.E., & Heward, W.L.
Applied Behavior Analysis (3rd ed.)
Pearson, 2020
Comprehensive ABA textbook. Source for task analysis (breaking the toileting skill into its component steps), differential reinforcement, and the behavioral principles applied throughout the Potty Talk™ method and Kinder Sleep™.
Potty Talk™ Kinder Sleep™
04
Bandura, A.
Social Learning Theory
Prentice-Hall, 1977
Social learning, children learn by observing and modeling caregivers, informs the caregiver sections of Kinder Weather™ and Kinder Sleep™. The repair-after-rupture principle ("you're modeling exactly what you want from them") is grounded in this framework.
Kinder Weather™ Growth Map
Play with Purpose™
play, learning & child-led exploration

The developmental and educational research behind Play with Purpose™, what different types of play build in children's brains, why unstructured play matters more than apps or flashcards, and how caregivers can set up environments that support learning through play without hovering or directing.

01
Hirsh-Pasek, K., Golinkoff, R.M., Berk, L.E., & Singer, D.G.
A Mandate for Playful Learning in Preschool: Presenting the Evidence
Oxford University Press, 2009
Comprehensive review of the evidence for play-based learning across cognitive, social, and emotional domains. Core reference for Play with Purpose™'s foundational argument that play is the primary mechanism of early learning, not supplemental to it.
Play with Purpose™
02
Lillard, A.S., Lerner, M.D., Hopkins, E.J., Dore, R.A., Smith, E.D., & Palmquist, C.M.
The impact of pretend play on children's development: A review of the evidence
Psychological Bulletin, 139(1), 1–34, 2013
Major review of pretend play's role in developing language, narrative, theory of mind, and self-regulation. Foundation for the Play Through Big Feelings session and the general case for imaginative play in the Unplugged Playroom session.
Play with Purpose™
03
Ginsburg, K.R. & the Committee on Communications, and Committee on Psychosocial Aspects of Child and Family Health, AAP
The Importance of Play in Promoting Healthy Child Development and Maintaining Strong Parent-Child Bonds
Pediatrics, 119(1), 182–191, 2007
AAP policy statement on play as essential to healthy development. Used in Play with Purpose™ to establish the pediatric consensus that unstructured play, not structured enrichment activities, is what children need most in the early years.
Play with Purpose™
04
Gray, P.
Free to Learn: Why Unleashing the Instinct to Play Will Make Our Children Happier, More Self-Reliant, and Better Students for Life
Basic Books, 2013
The research and argument behind the "case for boredom" concept in the Play with Purpose™ blog content and workshops. Gray's work on self-directed play as the natural mechanism for developing autonomy, creativity, and problem-solving informs the Unplugged Playroom and High/Low Rhythm sessions.
Play with Purpose™
05
Montessori, M.
The Absorbent Mind
Theosophical Publishing House, 1949 (English translation)
The theoretical basis for "invitations to play", carefully prepared environments that invite child-directed exploration. The Invitations to Play session in Play with Purpose™ draws directly from Montessori's prepared environment principles and the concept of the child as an active constructor of knowledge.
Play with Purpose™
Kinder Circles™
relationship literacy, body safety & social-emotional development

The developmental and child safety research behind Kinder Circles™, why "stranger danger" is neurologically counterproductive, how relationship literacy develops across early childhood, the body autonomy science, and the attachment foundation that makes safety education actually work. These sources underpin the four-circle framework and the age-staged tools in the Kinder Circles™ guide series.

01
Finkelhor, D., Asdigian, N., & Dziuba-Leatherman, J.
The Effectiveness of Victimization Prevention Instruction: An Evaluation of Children's Responses to Actual Threats and Assaults
Child Abuse & Neglect, 19(2), 141–153, 1995
Landmark research demonstrating that "stranger danger" framing is ineffective, and can actually reduce children's likelihood of seeking help from safe adults when they need it. The foundational evidence behind the Kinder Circles™ reframe from fear-based to relationship-based safety education.
Kinder Circles™
02
Wurtele, S.K.
Developmentally appropriate sexual abuse prevention education for young children: A parent education program
Behavior Modification, 17(3), 346–372, 1993
Research establishing that body autonomy and personal safety concepts can be taught effectively to children as young as 2–3 years when delivered through developmentally appropriate language and repeated practice. Informs the age-staged scripting in the Kinder Circles™ guide series.
Kinder Circles™
03
Ainsworth, M.D.S., Blehar, M.C., Waters, E., & Wall, S.
Patterns of Attachment: A Psychological Study of the Strange Situation
Lawrence Erlbaum Associates, 1978
Attachment research establishing that stranger anxiety (6–9 months) is healthy neurological development, not a problem to override. The Kinder Circles™ framework treats stranger anxiety as the first evidence of relationship discrimination working correctly, and the secure base as the prerequisite for all safety education.
Kinder Circles™ Growth Map
04
Haugaard, J.J. & Reppucci, N.D.
The Sexual Abuse of Children: A Comprehensive Guide to Current Knowledge and Intervention Strategies
Jossey-Bass, 1988
Foundational child safety research reviewing the evidence on prevention education, the role of trusted adults, and the developmental capacity of young children to understand safety rules. Informs the "safe adult network" concept in the Kinder Circles™ framework, the idea that the goal is not to fear all strangers, but to know how to find safe people.
Kinder Circles™
05
Briggs, F. & Hawkins, R.M.F.
Child Protection: A Guide for Teachers and Child Care Professionals
Allen & Unwin, 1997
Practical and research-based framework for age-appropriate safety education. Informs the Kinder Circles™ emphasis on empowering children to use their voice, recognize uncomfortable situations, and seek help from a trusted adult, rather than simply avoiding strangers.
Kinder Circles™
06
Schore, A.N.
The Science of the Art of Psychotherapy
W.W. Norton & Company, 2012
Neurobiological foundation for the Kinder Circles™ emphasis on consistent caregiver responsiveness as the basis of all safety learning. When a caregiver responds reliably to a child's cues from birth, they build the neurological template for trust, and the capacity to distinguish who is safe and who is not.
Kinder Circles™ Kinder Weather™
Kinder Guide™ · Screens & the Growing Brain
blue light, screen time & emotion regulation

The peer-reviewed research behind the Kinder Guide™ on screens, covering how blue light disrupts circadian rhythm and melatonin release, how screen exposure relates to developing brain networks for emotion and self-control, and the parent-child dynamics around screen time as an emotional coping tool. These sources underpin the mechanism cards and practical shifts in the parent resource and its Instagram teaser series.

01
Huang, P., Chan, S.Y., Ngoh, Z.M., et al.
Screen time, brain network development and socio-emotional competence in childhood: moderation of associations by parent-child reading
Psychological Medicine, 54(9), 1992–2003, 2024
Longitudinal brain-imaging study identifying a plausible biological pathway linking infant screen time to later socio-emotional competence, via integration of emotion-processing and cognitive-control brain networks. The primary citation behind the "developing brain" mechanism card in the Screens guide.
Screens Guide
02
Haghani, M., Abbasi, S., Abdoli, L., et al.
Blue Light and Digital Screens Revisited: A New Look at Blue Light from the Vision Quality, Circadian Rhythm and Cognitive Functions Perspective
Journal of Biomedical Physics & Engineering, 14(3), 213–228, 2024
Review of how short-wavelength blue light disrupts circadian rhythm, sleep, and cognitive function. Source for the "the light itself" mechanism card explaining how screen light delays melatonin release.
Screens Guide
03
Chronobiology in Medicine (review)
Impacts of Blue Light Exposure From Electronic Devices on Circadian Rhythm and Sleep Disruption in Adolescent and Young Adult Students
Chronobiology in Medicine, 6(1), 10–14, 2024
Explains the ipRGC → suprachiasmatic nucleus → pineal gland pathway by which blue light suppresses melatonin while simultaneously activating alertness circuits (orexinergic, dopamine, and serotonin pathways) — the mechanism behind the "alertness vs. calm" card showing why regulation drops as alertness rises.
Screens Guide
04
Emotional Reactivity and Behavioral Problems in Preschoolers (study)
The Interplay of Parental Stress, Media-Related Coping, and Child Screen Time
Children, 12(2), 188, 2025
Found that parents of emotionally reactive children often use screens to manage distress, which can undercut the development of self-regulation and contribute to externalizing behavior problems. Source for the "coping loop" card distinguishing occasional screen use from screens as the only regulation tool.
Screens Guide
05
Al-shoaibi, A.A.A., et al.
Adolescent Brain Cognitive Development (ABCD) Study — screen use and family conflict analysis
2024
Large longitudinal U.S. cohort documenting a link between elevated screen usage and heightened family conflict, often mediated by screens serving as an emotional escape valve that triggers parental limit-setting and household friction. Source for the "family ripple" card.
Screens Guide
06
Hedderson, M.M., Bekelman, T.A., Li, M., et al.
Trends in Screen Time Use Among Children During the COVID-19 Pandemic, July 2019 Through August 2021
JAMA Network Open, 2023
Cohort study documenting sustained increases in children's daily screen time through and after the pandemic. Trend context supporting why this conversation matters more now than five years ago.
Screens Guide
all workshops · caregiver section
caregiver wellbeing & self-regulation

Every kinder co. workshop includes a dedicated segment on the caregiver, because the research is unambiguous: a regulated caregiver is the single most powerful intervention available to a child. These sources inform the caregiver sections in Kinder Weather™ and Kinder Sleep™, and the general philosophy that parents cannot pour from an empty cup.

01
Porges, S.W.
The Polyvagal Theory: Neurophysiological Foundations of Emotions, Attachment, Communication, and Self-Regulation
W.W. Norton & Company, 2011
Polyvagal theory, the nervous system's role in social engagement and co-regulation, is the neurobiological foundation for the caregiver weather segment in Kinder Weather™. Children's nervous systems read caregiver physiological state before they register words. This is why "your calm is the intervention."
Kinder Weather™ Kinder Sleep™
02
Hughes, D.A. & Baylin, J.
Brain-Based Parenting: The Neuroscience of Caregiving for Healthy Attachment
W.W. Norton & Company, 2012
The neuroscience of the caregiving system, what happens in a caregiver's brain during stress, and how to return to a regulated state. Directly informs the "repair after rupture" and "what to do when you're under a warning" content in the caregiver segments.
Kinder Weather™ Growth Map
03
Ainsworth, M.D.S., Blehar, M.C., Waters, E., & Wall, S.
Patterns of Attachment: A Psychological Study of the Strange Situation
Lawrence Erlbaum Associates, 1978
Attachment theory research establishing the secure base concept, that children explore and develop best when they have a reliable, responsive caregiver to return to. Foundational to the Kinder at Play approach and the "10 minutes of floor time" recommendation in the Growth Map.
Growth Map Play with Purpose™

this list is a living document.

As kinder co. grows and new workshops are developed, this page will be updated to reflect the research behind each new offering. If you're a practitioner, researcher, or educator who wants to discuss the evidence base behind a specific framework or approach, reach out, that kind of conversation is always welcome.