One moment your child is fine. The next, they’re on the floor, screaming, hitting, or completely shut down.
You didn’t do anything wrong. Nothing obvious happened. And yet here you are, wondering: What just happened?
Here’s what I tell the parents I work with after 23 years as a paediatric OT.
It didn’t come out of nowhere. You just couldn’t see it building.
Normal toddler behaviour - or something more?
Big emotions, meltdowns, hitting, refusing - these are developmentally normal. Toddlers don’t yet have the brain capacity to manage big feelings. They are not being difficult. They are being three.
But
Sometimes what looks like a typical tantrum is actually sensory overwhelm. The two can look almost identical from the outside and the difference changes everything about how you respond.
The bucket analogy
From the moment your toddler wakes up, their nervous system is processing everything. Light, sound, touch, movement, transitions, other people’s emotions.
Most of the time, they manage. But toddlers have small buckets and the world fills them fast.
A busy morning. A loud shop. A skipped nap. Three transitions before 9am. Each one adds a little more.
Then something small happens a sock that bunches, a “no” about a biscuit and the bucket overflows.
That’s the meltdown. Not the cause. The overflow.
Fight, flight, and freeze
When a toddler hits their limit, they don’t think, they react. In one of three ways.
Fight is what we notice most. Hitting, biting, throwing, screaming. Not defiance, alarm. Their body is in full survival mode.
Flight is more subtle. Running away, refusing to engage, bolting. They’re not being naughty. They’re trying to escape something that genuinely overwhelms them.
Freeze is the one most parents miss. Going blank. Withdrawing. Not responding when you call their name. This is a nervous system that has shut down to cope. It looks like nothing is happening. Actually, everything is.
What helps in the moment
When your child is overwhelmed, this is not a teaching moment. Reasoning and consequences won’t land, the brain isn’t available for that yet.
1. Reduce input first. Move somewhere quieter. Lower your voice. Less coming in means more capacity to come back.
2. Your calm is the intervention. Your regulated nervous system helps theirs settle. Fewer words. Slower movements. Stay close without demanding.
3. Support the body before the mind. Gentle weight and pressure, a weighted animal held close, helps activate the calming response. Slow movement, like rocking or a balance board, releases physical tension when words won’t work.
4. Offer one simple choice. “Do you want to sit inside or outside?” Choice restores a sense of control, exactly what overwhelm takes away.
What helps before the meltdown
This is where the real shift happens.
Toddlers need small, regular doses of sensory input throughout the day to stay regulated. Not therapy, just play that naturally gives their bodies what they need.
Pouring and scooping. Fidgeting with something small and satisfying. Ten minutes on a balance board before a transition you know is hard. These moments keep the bucket from filling so fast.
The question that changes everything
Most parents ask: Why is my child doing this?
The more useful question is: Is my child’s body overwhelmed right now?
Because sometimes it’s typical toddler behaviour that needs a calm, clear boundary. And sometimes it’s a child whose nervous system is full who needs a completely different response.
Learning to tell the difference is one of the most useful things you can do in these early years.
Your toddler isn’t trying to make your life harder. They’re navigating a world that is enormous and unpredictable, with a brain still very much under construction.
When we shift from what’s wrong with them to what’s happening with them, everything changes.
Want to go deeper?
In our next post, Let's unpacks the signs of sensory overload in toddlers and what to do before it becomes a meltdown. Watch this space.