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Parenting›Ages 10–14›The Growing Brain

Between 10 and 14, Your Child's Brain Is Going Through Its Biggest Change Since Toddlerhood. What Gets Wired In Now Can Shape How They See Themselves for Years to Come. Kids Are Rewiring It on Purpose With Simple 5-Minute Daily Challenges.

There's one sentence almost every middle schooler starts saying: "I'm just not good at that." Most kids believe it the moment they say it. The truth is, their brain is still deciding whether it's true.

October 2026
Note: Scientists used to think the brain did its only major building in early childhood. But newer brain-imaging research has revealed a second major window of change, and it opens with puberty, right around middle school.

Every new skill comes with a hidden tipping point most kids don't see coming.

It shows up right after the excitement wears off and right before things start to click. The math unit stops making sense. The new sport stops being fun. The drawing doesn't look like the picture in their head.

From there, it can go one of two ways. They push through. Or they decide, "I'm just not good at this."

In middle school, that choice carries extra weight.

Researchers at the National Institute of Mental Health found that around age 11 in girls and 12 in boys, the brain starts strengthening the connections kids use most. They nicknamed this process "use it or lose it."

In other words, they get better at what they do again and again.

Here's what that means for your child: Every time they choose to stick with something hard, or choose to give up, their brain gets a little better at making that choice again.

But making that choice on purpose is harder than they might think. Because giving up rarely sounds like giving up. Instead, it often sounds like: "I'm just not a math person." "I'm not the creative one." "It's fine. I don't care." Usually right after a bad test, an awkward tryout, or a project that didn't turn out the way they pictured.

It's easy for middle schoolers to have these thoughts and assume that it's just how it is… or that it's just who they are. But it isn't.

The Part of the Curve That Catches Everyone Off Guard

Here's what most kids don't realize: when something gets hard, it's not a sign they're bad at it.

It's actually the moment real learning starts.

Almost everything they try, from a tough math unit to a new sport or even a new social setting, follows the same ride. It starts out interesting. Then it gets hard. Then it gets really hard… right before it starts to click.

The "Goal"-ler Coaster page from the Challenges Kit: a roller coaster dipping from "This is so great!" down to "Maybe I should quit," where grit starts growing, and back up to "I did it!"

The "Goal"-ler Coaster, from the Challenges Kit: Growth Mindset Edition

Kids who don't know about the dip take it personally. They think it means they're failing, so they stop. (Skill practiced: giving up)

Kids who do know about it recognize, "Oh. This is the part where it gets hard." They're able to keep going, knowing exactly where they are on the curve. (Skills practiced: perseverance, confidence, grit, growth mindset)

That one shift changes which response gets practiced, and which one gets wired into their rapidly changing brain.

She Wasn't Failing. She Was in the Dip.

In 2008, Nastia Liukin won the all-around gold medal in gymnastics at the Beijing Olympics. But years earlier, after a particularly hard day at the gym, she stormed out and told her mom she was done.

Her mom didn't argue. She said, "Ok. If that's what you want. But not today."

She kept bringing Nastia back, day after day, until she finally had a really good day. Then she told her, "Ok. Now you can quit."

Nastia's answer: "What? I don't want to quit!"

This simple message, "Never quit on a bad day," was powerful enough to carry her through everything that came next and is a phrase she still lives by today.

Nastia moved through the learning curve more than once. But every time she hit the bottom, kept going, and pushed through the hard parts, she strengthened a path in her brain that became easier to follow each time she took it.

What This Means for Your Child

Your child can build that same path.

Every time they hit the dip and keep going, even a little, they're not just getting better at math or soccer. They're strengthening the path that takes them through the hard part, until it becomes the one their brain reaches for first.

And what's even better: Every time they come out the other side, they collect more proof they can push through it again.

That's where real confidence comes from. Not from being told they're good, but from knowing they've been at the bottom before, and climbed out.

Knowing Helps. Practicing Is What Sticks.

Most kids already know they shouldn't give up. They've heard it over and over.

But in the moment, when the math stops making sense or the tryout goes badly, kids don't reach for what they've been told. They reach for what they've practiced.

What sticks is experience: small chances to hit the dip, use a simple plan, push through, and keep the proof that they did.

The hard part is making that happen on a regular Tuesday night, between homework and bedtime.

That's what The Challenges Kit: Growth Mindset Edition was built for. It was created by Jen, a mom of four who creates growth mindset resources for families, after watching her own children pull back from hard things.

A Simple Way to Practice, 5 Minutes at a Time

The Challenges Kit: Growth Mindset Edition gives kids a simple, realistic way to practice turning self-doubt into self-belief for confidence that sticks around… even when things start to get tough.

Think of it like confidence journaling with a twist.

It takes kids through 5 sets of short, daily challenges (plus a free bonus set) that build skills they can take with them into the classroom, onto the field, into their friend groups and more.

The challenge format makes it easy for kids 10–14 to either move through the challenges on their own or complete them with a friend or family member while collecting motivating wins that build on each other, rewiring their brain and creating a mindset for growth.

Each themed challenge helps kids practice moving through the same simple loop:

The Growth Mindset Cycle page from the Challenges Kit on a kitchen table: Take Action, Build Skills, Grow Belief, Create Confidence, then Keep Going

The Growth Mindset Cycle, from the Challenges Kit: Growth Mindset Edition

Notice where confidence shows up: at the end, not the beginning.

Help My Child Build Confidence That Sticks →

Instant download · Ages 10–14

It's for You Too

These challenges were created to help your child collect proof that they're capable and can do hard things.

But it was also created to help you. You want to give your child the mindset and skills that will help them tackle middle school with confidence. But finding the time and knowing where to start isn't easy.

The Challenges Kit: Growth Mindset Edition does the heavy lifting for you.

What You Actually Get

5 challenge sets that work together for growth: Confidence, Growth Mindset, Gratitude, Friendship and Kindness.

5 short daily challenges per set: Most take 5–10 minutes. Small enough to start tonight, real enough to count as proof.

The Growth Mindset Cycle, "Goal"-ler Coaster, and more: Kid-friendly visuals with real-life strategies they can use again and again.

A cheat sheet, checklist and mind map for every set: Motivating ways to understand the goal of each challenge and keep track of progress.

Works solo or together: Simple enough to do independently, for the kid who doesn't want anyone watching them struggle.

FREE one-time bonus, the 5-Day Character Challenge: Extra activities on grit, strengths, and overcoming negative thinking.

What This Isn't

The Challenges Kit: Growth Mindset Edition is NOT:

Another stack of school worksheets. The challenges are about their real life.

A lecture you have to deliver. Your child works through it on their own.

Only for kids who are already struggling. It's for any 10 to 14-year-old heading into the years when things get harder.

A big time commitment. Most activities take 5–10 minutes.

What Other Families Are Saying

"Middle school is no joke! Thank you for creating something specifically for this age group. My kids NEED this...and so do I!"

Kim T.

"The Kindness Challenge is great! My kids are looking for little ways to be kind all on their own now. Even if it's not on the chart! (Ages 11 and 13)"

Kendra W., parent

"Love! As a school-based therapist, I can't tell you how much we need this at the eighth grade level."

Meagan O., school-based therapist

The Part Nobody Talks About

Here's what Jen hears from families who've used the Challenges Kit, and it's never about the printable pages.

"They don't email me to say 'great printables,'" she says. "They email me to say things like this."

"My daughter is usually so hard on herself. She's finally understanding that it's ok to be bad at things at first."

Or, "I'm learning a lot about my daughter. We're working on these challenges together and I never realized some of the thoughts that held her back. It's making for a lot of good conversations."

Or, "My son hates pep talks. But he likes working on this, especially because it feels like a game!"

The Challenges Kit: Growth Mindset Edition isn't about giving your child more work to do.

It's about helping them stop wondering IF they're capable, so they can start seeing the many ways they ARE.

Just $17. One Time Purchase. FREE Bonus Challenge Included.

The Challenges Kit: Growth Mindset Edition normally sells for $47. Right now, it's just $17. That's 63% off.

For context, that's less than what most families pay for a single tutoring session.

One-time purchase. Instant download. Just print and go.

Start Building Confidence That Sticks →

Instant download · FREE bonus challenge · Ages 10–14

These are the years your child starts deciding what they're capable of. The Challenges Kit: Growth Mindset Edition gives them lots of small chances to find out, one tiny, doable challenge at a time.

Because confidence doesn't just happen. It grows little by little, one small win at a time.

And for less than a single tutoring session, your child can start collecting those wins today.

Help My Child Build Confidence That Sticks →
This page is an advertisement from This Time of Mine, not a news article. Every child is different, and results vary. This page is for general education and isn't medical or psychological advice.

Sources: UNICEF, The Adolescent Brain: A Second Window of Opportunity · NIMH, The Teen Brain: 7 Things to Know · Alliance for Excellent Education, Science of Adolescent Learning (2018) · Jay Giedd, NIMH, interview in PBS Frontline, "Inside the Teen Brain". Questions? jen@thistimeofmine.com