Co-regulation before self-regulation: what the developmental science says

"He needs to learn to calm himself down." It's one of the most common things said about toddlers, and it contains a quiet assumption: that a two-year-old could calm down on their own, if only they tried harder or were taught firmer boundaries. The developmental science says the assumption is backwards. Self-regulation isn't a matter of willpower a toddler is withholding. It's a capacity that gets constructed over years — and the construction material is co-regulation with a calm adult.

The misunderstanding at the heart of "calm down"

The most useful framework here comes from a series of reports commissioned by the US Administration for Children and Families' Office of Planning, Research and Evaluation (OPRE). The foundational review, led by Desiree Murray and colleagues at Duke, defines self-regulation as the act of managing cognition and emotion to enable goal-directed action — organising behaviour, controlling impulses, solving problems calmly.¹

Crucially, the review lays out seven key principles of how this capacity develops, and two of them reframe everything about toddlerhood: self-regulation develops over an extended period from birth through young adulthood, and its development depends heavily on caregiver support — what the authors call co-regulation — interacting with the child's biology and environment.¹ In other words: the skill everyone wants the toddler to use is, at that age, mostly located in the adult standing next to them.

What the developmental research actually says

The companion OPRE practice brief by Katie Rosanbalm and Desiree Murray defines co-regulation as an interactive process of regulatory support occurring within caring relationships, and identifies three things caregivers provide:²

1. A warm, responsive relationship — the child's baseline sense that a trusted adult is available and will respond.
2. A structured, predictable environment — routines and consistency that lower the background stress load. (This is its own research story; see why knowing what comes next calms an anxious child.)
3. Teaching and coaching — naming feelings, modelling calm, and gradually handing over strategies as the child can use them.

The brief is explicit that what co-regulation looks like changes with age: for infants it's mostly physical soothing and responsive routines; for toddlers it's calm presence plus words for feelings plus short, concrete strategies; for preschoolers it's coaching through problems and rehearsing ahead of time. The adult's regulation is the scaffold at every stage — it just gets handed over plank by plank.²

Why toddlers borrow your nervous system

Why can't a toddler just self-soothe? Partly because the brain systems doing the regulating — prefrontal networks that inhibit impulses and shift attention — are among the slowest-maturing in the whole brain, developing well into a person's twenties.¹ A dysregulated toddler isn't refusing to use the brakes; the brakes are still being installed.

What toddlers do have is an exquisitely tuned link to your state. Ruth Feldman's research on parent–infant synchrony shows that from the first months of life, parent and child physiology and behaviour become temporally coordinated — matched rhythms of gaze, touch, vocalisation, even heart-rate patterning — and that this synchrony is a formative experience that shapes the later development of self-regulation and empathy.⁴ When you slow your breathing and soften your voice next to a distressed child, you aren't just modelling calm as an abstract lesson. You are giving their nervous system a steadier rhythm to entrain to. "Borrowing your calm" is close to a literal description.

Language is the other big handover. A longitudinal study following children from 18 to 48 months found that toddlers with stronger and faster-growing language skills showed less anger by preschool age — partly because words let them ask for help and redirect themselves instead of erupting.⁵ Giving a child vocabulary for what's happening inside them is co-regulation too; it's the entire premise of our Emotion Decoder, which helps parents translate a behaviour into the feeling underneath it.

Shanker's reframe: stress behaviour, not misbehaviour

The Canadian developmental psychologist Stuart Shanker has done more than almost anyone to bring this science to parents. His Self-Reg framework starts with a distinction that changes how you see a meltdown: much of what adults read as misbehaviour — defiance, volatility, aggression — is better understood as stress behaviour: a child whose stress load has exceeded their capacity to manage it.³

The practical consequence is a shift in the adult's job description. If the behaviour is a choice, the response is consequences. If the behaviour is an overloaded stress system, the response is to reduce the load and lend your calm — and only later, when the child is regulated, to teach. We've written before about why this distinction matters so much in early childhood settings, in behaviour management vs emotional regulation.

Co-regulation in practice: what it looks like on a Tuesday

• Regulate yourself first. Your calm is the intervention. A slow exhale before you respond isn't self-indulgence; it's the first step of the technique.
• Get low, get close, get quiet. Physical proximity, a soft voice and a slower pace all give the child's system something to sync with.⁴
• Name it simply. "You're really angry. The tower fell." No lecture — a label. Words for feelings are borrowed regulation until they become owned regulation.⁵
• Keep the boundary, warmly. Co-regulation isn't permissiveness. "I won't let you hit. I'm right here" holds both.
• Rehearse when calm. Regulation strategies are learned in calm moments and merely retrieved in stressed ones. This is where preparation stories earn their keep — a well-built Social Story lets a child rehearse a hard moment (drop-off, the dentist, sharing) alongside a calm adult, days before the moment arrives. It's the mechanism Little Narratives is built on: the story is a co-regulation session in disguise.

The long game: from co-regulation to self-regulation

None of this means a child will need you at their elbow forever. The whole point of the developmental account is that repeated, reliable co-regulation is precisely how independent self-regulation gets built — thousands of small loans that eventually become the child's own capital.¹² The toddler who borrows your calm at two is practising the moves they'll perform alone at five, and coach themselves through at twenty-five.

The science offers parents a genuinely kinder frame. On the hard days, you are not failing to teach your child self-control. You are being their self-control — on loan, with interest, until they've built their own.