11/28/2025
PODCAST ALERT…Bluma Claire Sapir and I were on Spoil Your Baby Podcast - We talk about parenting siblings and healing your sibling relationships 0E with Greer Kirshenbaum.
From Babyhood to Siblinghood: How Early Bonds Shape Lifelong Calm or Conflict
The concept builds on what you’ve already illuminated so powerfully—that the same biological systems that regulate an infant’s sense of safety continue to govern emotional regulation in adulthood. Sibling relationships, which 90% of humans experience, are our earliest training ground for learning how to get along—and how to handle conflict (or not). Yet they’re also the most overlooked sources of suppressed trauma, since conflict, aggression, and emotional neglect between siblings are often minimized as “normal rivalry.” When left unrecognized or unhealed, those early dynamics imprint deep patterns of vigilance, competition, and dysregulation that shape how we experience safety and connection throughout life.
We’d love to explore this continuum with you—how early patterns of co-regulation or dysregulation become lifelong emotional templates, and how repairing sibling bonds in adulthood can literally rewire the nervous system toward calm and connection.
Your message that “nurture is not indulgence—it’s biology” dovetails perfectly with our belief that “repair is not regression—it’s evolution.” Together, these ideas open a conversation on the biology of relationships—from cradle to adulthood—and how “spoiling our siblings” with curiosity and empathy can heal family dynamics, boost personal well-being, and, once the adult sibling bond is restored, help siblings discover their true purpose in life.
Greer Kirshenbaum, PhD, is a neuroscientist, doula, author, and sleep specialist who champions “The Nurture Revolution,” showing how responsive caregiving in pregnancy and infancy builds resilient brains to prevent anxiety, depression, and addiction. Trained at the University of Toronto, Columbia, and Yale, she authored The Nurture Revolution to translate neuroscience into practical parenting tools for lifelong mental health.
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