My toddler had a meltdown in Target. I had to borrow my own calm.

Last Tuesday, in the snack aisle at Target, my two-year-old went fully horizontal on the linoleum because I would not buy the goldfish in the rainbow bag (we had the orange bag at home). A man with a beard looked at me with great pity. I looked back with great pity for both of us.

I crouched down. I took a breath. I said, in the calmest voice I could borrow from somewhere: "You're so disappointed. That bag is so cool."

She cried harder for 90 seconds. Then she stopped.

This is called co-regulation

Toddlers' prefrontal cortex — the part that handles "calming yourself down" — is functionally a construction site until about age 4, and not really finished until 25. They literally cannot do it alone yet. They need to *borrow* a nervous system that is already regulated. Yours.

This isn't a metaphor. There's a real, measurable phenomenon called "physiological synchrony" — heart rate and cortisol levels in parent and child move together (Feldman, 2017, *Trends in Cognitive Sciences*). When you calm down, they calm down. When you tighten up, they tighten up. It's wireless.

What this means on a hard day

- If I'm dysregulated, I can't regulate her. Step one is me. - Sometimes that means I do nothing but breathe slowly and stay close. - "Use your words" doesn't work in a meltdown. The part of her brain that uses words is offline.

What I wish someone had told me at 6pm in Target

The meltdown is not bad behavior. It is a small person whose system is overloaded, asking — loudly — for a bigger system to lean against.

— Rosa