How to Teach An 18 Month Old to Share Without Forced Sharing

A Montessori approach to cooperation, boundaries, and early social skills

If you’re wondering how to teach an 18 month old to share, you’re not alone.

It’s one of the most common toddler struggles. You’re at the park. Another child reaches for the toy. Your toddler clutches it tighter. Maybe there’s yelling. Maybe there’s grabbing. Maybe there are tears… from everyone.

At 18 months, sharing can feel impossible.

But here’s something important to understand:

An 18 month old is not refusing to share.

They are not being selfish.

Developmentally, they are not ready to share in the way adults expect.

Before we teach sharing, we need to understand what’s actually happening at this age and how a Montessori approach can guide us.

Why an 18 Month Old Isn’t Ready to Share Yet

At 18 months, toddlers are in a powerful stage of development. They’re building autonomy, discovering ownership, strengthening attachment, and slowly beginning to understand themselves as separate people with preferences, boundaries, and control.

This is also why many toddlers move deeply into the “mine” phase around this age.

It isn’t selfishness.

It’s development.

Ownership helps toddlers feel secure, develop identity, and begin understanding boundaries. When a toddler says “mine,” they’re usually not rejecting other people — they’re establishing a sense of self.

And that’s a healthy part of development.

At this age, emotional intensity and clinginess can also increase as attachment awareness grows stronger, which is why many parents suddenly notice more emotional reactions around separation, boundaries, or favourite objects.

Why Forcing Sharing Often Backfires

Many well-meaning adults instinctively say things like:
“Share.”
“Let them have it.”
“You have to share.”

But at 18 months, forced sharing often creates more frustration, insecurity, and power struggles rather than genuine cooperation.

From a Montessori perspective, we don’t force generosity. Instead, we prepare the environment and guide cooperation gradually over time.

In Montessori settings, children are generally not expected to hand over materials while they’re still deeply engaged with them. Play is viewed as meaningful work for young children, and interruption can feel frustrating in much the same way it would for an adult suddenly being asked to “share” their laptop halfway through an important task.

That doesn’t mean toddlers never learn patience, turn-taking, or generosity. But these skills tend to develop more naturally when children feel secure that their concentration, work, and belongings will be respected too.

A child who feels safe with their belongings is often far more willing to eventually offer them freely.

Montessori focuses on building cooperation through security, boundaries, modelling, and trust — not forced compliance.

What You Can Teach Instead at 18 Months

At 18 months, instead of teaching “sharing,” we teach:

• Taking turns
• Waiting
• Respect for others’ use
• Language for social interaction

These are the foundations of sharing.

Sharing is the outcome.

Turn-taking is the skill.

Step 1: Respect Ownership First

One of the most powerful Montessori principles is respect, including respect for a toddler’s attachment to an object.

If your child is actively using something, you can say:

“You’re still using it.”

If another child wants the toy, you can calmly say:

“They’re still using it. When they’re finished, you can have a turn.”

You are not refusing sharing.

You are introducing turn-taking.

And that is developmentally appropriate.

Step 2: Teach Turn-Taking Language

An 18 month old cannot yet negotiate socially.

But they can begin to learn simple scripts.

Instead of saying “Share,” try:

“When you’re finished, they can have a turn.”
“My turn next.”
“We’ll take turns.”
“Do you want to trade?”

You can model these repeatedly.

Even if your child cannot say them clearly yet, hearing them builds understanding.

Repetition builds language. Language builds cooperation.

If you’re trying to reduce power struggles more generally, these alternative phrases to saying “no” can also help support cooperation.

Step 3: Prepare the Environment to Reduce Conflict

Montessori emphasizes the prepared environment.

When toddlers have access to:

• Duplicate toys
• Open-ended materials
• Predictable routines
• Calm adult responses

Conflicts decrease naturally.

If you’re hosting a playdate, consider:

• Having similar toys available
• Rotating special toys out of reach
• Creating defined play spaces

It is easier to guide sharing in a calm environment than during chaos.

If your toddler struggles to play alone or constantly seeks your attention, the setup matters more than you think. The right materials can dramatically increase focus and confidence. I’ve shared a full breakdown of the best Montessori tools for independent play here, including practical life activities and simple shelf setups that actually work at home.

Sometimes the challenge isn’t motivation, it’s regulation. If your toddler struggles with sensory overload, adding the right calming materials can make independent play feel safer and more manageable. This guide to Montessori-inspired sensory toys for autistic toddlers outlines practical tools that support focus while respecting sensory needs.

Step 4: Guide, Don’t Label

Avoid phrases like:

“You’re not being nice.”
“That’s selfish.”

At 18 months, these words don’t teach social skills.

They create confusion and shame.

Instead, describe what you see:

“You don’t want to give it up right now.”
“They would like a turn.”

Then guide:

“We’ll take turns.”

Calm tone matters more than perfect wording.

Your regulation teaches regulation.

Step 5: Model Sharing in Everyday Life

Children learn generosity by watching it.

You can model:

“I’m finished with this. Would you like it?”
“I’ll wait for my turn.”
“Thank you for letting me use that.”

Real-life modelling is more powerful than lectures.

Montessori is rooted in example.

Children absorb what they observe.

What to Do When Your 18 Month Old Refuses to Share

At this age, emotional regulation is still developing.

(Sleep disruption and overtiredness can also increase emotional reactions at this age. You can read more about why 18 month olds get hyper before bed here.)

When another child grabs a toy, your toddler may:

• Cry intensely
• Hit
• Grab back
• Collapse into tears

This is not manipulation.

It’s emotional immaturity.

You can respond calmly:

“I won’t let you hit. You’re upset. We’ll take turns.”

This combination builds safety.

If big emotions are frequent right now, you may also find helpful language in our guide to what to say during a toddler meltdown.

When Will Sharing Develop Naturally?

Around ages 2.5–3, something shifts.

As language develops and impulse control strengthens, toddlers begin to:

• Offer toys spontaneously
• Negotiate turns
• Trade willingly
• Express empathy

That generosity feels genuine.

It grows from:

Security
Boundaries
Practice
Observation
Time

You are not behind if your 18 month old struggles with sharing.

They are exactly where they should be.

Final Thoughts on Teaching Sharing at 18 Months

At 18 months, sharing is still developing alongside emotional regulation, language, impulse control, and a growing sense of identity.

What helps most at this age usually isn’t pressure or forced generosity, but calm guidance, predictable boundaries, and repeated opportunities to experience turn-taking safely over time.

The “mine” phase is not a flaw in development.

It’s part of how toddlers begin understanding ownership, autonomy, and other people.