"Use your words" is one of the most repeated pieces of parenting advice for toddlers. What is less often explained is the neuroscience behind why it works — and why the words need to come before the child can generate them independently.
Healthbooq provides science-based guidance on emotional development and the parent's role in building children's regulatory capacity.
Affect Labelling: The Neuroscience
Research by Matthew Lieberman and colleagues at UCLA has demonstrated that putting feelings into words — "affect labelling" — reduces the activity of the amygdala (the brain's threat and emotional reactivity centre) and increases activity in the right ventrolateral prefrontal cortex.
In plain terms: naming an emotion partially regulates it. The act of labelling activates the very brain regions that modulate emotional reactivity. Language is not describing an emotional state from outside it; it is changing the state from within.
This mechanism has been demonstrated in adults. In young children, the same principle applies developmentally — but the language must initially come from outside (from the caregiver) because the child does not yet have either the vocabulary or the regulatory capacity to generate it independently.
Why the Parent's Language Matters
When a parent names a child's emotional experience — "You're really angry about that" — before the child can name it themselves, several things happen simultaneously:
- The child's emotion is acknowledged. Acknowledgement itself is regulatory — the felt sense of being understood reduces the intensity of the emotional state.
- The emotion is separated from the behaviour. Naming the emotion implicitly distinguishes between the feeling (valid) and the action (which may or may not be acceptable).
- The emotion is given a word. Repeated exposure to emotion words in context gradually builds the child's own emotional vocabulary.
- The child's arousal is reduced. Via the affect labelling mechanism, the parent's naming of the emotion produces a mild regulatory effect.
The Development of Children's Emotional Language
The timeline for emotional language development:
- 12–18 months: No emotional vocabulary; emotions expressed entirely through behaviour and vocalisation
- 18–24 months: First emotion words appear ("no," "mine," basic affects like "happy," "sad" may appear)
- 24–36 months: Emotional vocabulary expands significantly; child begins to name their own states ("I scared," "I sad")
- 36–48 months: More nuanced emotional vocabulary; child can describe causes and consequences of emotions; beginning of emotional narratives
The expansion from 18–36 months is the critical period for emotion vocabulary development, and the quality of the parent's emotional language during this period directly shapes the breadth and sophistication of the child's emotional vocabulary.
Practical Applications
Narrate emotions in the moment: "I can see you're frustrated. You really wanted that."
Use emotion words in non-distress contexts: Picture books, everyday descriptions, play contexts — building emotion vocabulary when the child is regulated is more effective than introducing it during meltdowns.
Include physical sensations: "Your face looks tight. Your hands are in fists. You might be feeling angry." Connecting emotional words to body sensations builds somatic emotional awareness.
Don't expect immediate uptake: The child may not yet use the word themselves. You are building toward a capacity that will emerge weeks or months later.
Key Takeaways
Language is not merely a way to communicate emotions after they have been experienced — it is a tool for regulating them in real time. The capacity to name an emotion ('I'm angry') activates prefrontal regions involved in emotional regulation and partially down-regulates limbic reactivity. This is why expanding a toddler's emotional vocabulary is not just socially useful — it is directly building their neurological regulation capacity.
