When a toddler melts down, the rational, reasoning part of their brain — the prefrontal cortex — has gone offline. What you're seeing is the limbic system: pure emotion, no logic. This is why reason and explanation don't work in the middle of a tantrum.
The prefrontal cortex doesn't fully develop until the mid-twenties. Toddlers are quite literally not neurologically capable of the self-regulation we expect of them. This isn't an excuse — it's a map.
During a tantrum, connection before correction is the evidence-based approach. Stay near, stay calm, and don't try to reason or lecture until the child has returned to a regulated state. Co-regulation — your calm nervous system helping theirs regulate — is the mechanism.
Avoid two common errors: giving in to stop the tantrum (which teaches that tantrums work) and responding with your own escalation (which prolongs and intensifies the episode).
After the storm has passed and the child is regulated, that's when brief, simple discussion is possible. 'You felt really upset. Let's take some breaths.' This builds emotional vocabulary and self-awareness over time.
Tantrums peak around age 2 and typically decrease substantially by 4 as language and prefrontal development advance. Your consistent, calm presence during the storm is what teaches the regulation skills that eventually make tantrums shorter and less frequent.