7 STEM Activities for Toddlers Ages 18-36 Months That Actually Hold Their Attention

A toddler can lose interest in an activity before you've even finished setting it up, especially when the interesting part only happens once.

These work better for that kind of kid because the payoff resets fast. The washcloth can go through the tube again, the blocks can be stood back up, the lid can spin one more time, and the water stream can start and stop as many times as they want. There isn't much waiting between action and result.

That repeatable little loop is often what keeps a toddler hanging around. If yours finds one piece they love and ignores the rest, let them stay there. The activity doesn't need a neat ending to have done its job.

1. Tube Angle Drop

Use one wide clean cardboard mailing tube and one large rolled washcloth that fits through it easily but is still far too large to fit in a toddler's mouth. Hold the tube almost upright and drop the washcloth through. Lower the tube angle and try again. Put a wide basket at the bottom to catch it.

A basket at the bottom saves you from chasing the washcloth across the room after every drop. Let your toddler retrieve it, put it back in the top, and help change the angle after a few rounds. That reset is quick enough that kids who like posting and dropping objects can stay with it for a while.

Why it works: The tube angle changes how gravity moves the same soft object through the tunnel.

Age range tweak:

• 18-24 months: Hold the tube for them and let them drop the washcloth in.
• 24-36 months: Let them help tilt the tube and compare steep and shallow angles.

2. Ball-in-a-Bowl Orbit

Put one large lightweight ball inside a very wide plastic mixing bowl. Hold the bowl steady at floor level and tilt one side only a little so the ball rolls around the curved inside wall. Flatten the bowl again, then tilt from another direction and repeat.

Use a bowl wide enough that the ball has room to travel around the inside instead of immediately jumping out. Once your child sees the circular path, let them help with tiny tilts from different sides. They'll often get very serious about trying to keep the ball moving, which is exactly the loop you want here.

Why it works: The curved bowl redirects the rolling ball while gravity pulls it toward the lowest part of the bowl.

Age range tweak:

• 18-24 months: Let an adult hold the bowl and make slow gentle tilts.
• 24-36 months: Let the child help tilt the bowl with both hands and try to keep the ball moving around the edge.

When You Need More Screen-Free Ideas

We made a free Screen-Free Activity Finder for exactly this. Pick your child's age, how much time you have, how much energy they have, and how much help you can give. It'll send you screen-free activity ideas that use normal home materials.

Drop your email and we'll send it over. Unsubscribe anytime.

3. Big Block Domino Chain

Stand several large foam blocks in a line with small gaps between them. Let your toddler push the first one and watch the chain fall. Rebuild with bigger gaps, smaller gaps, or one turn in the path.

Keep the first line short enough that rebuilding doesn't take forever. After the child gets the satisfying crash, let them help stand the blocks back up and decide where the next gap goes. If the chain stops halfway, that's useful too because they can immediately see which spacing needs fixing.

Why it works: Each falling block has to reach the next one, so spacing changes whether the chain reaction keeps going.

Age range tweak:

• 18-24 months: Build a short straight line and let them knock over the first block.
• 24-36 months: Let them help place the blocks and test wider or narrower gaps.

4. Stop-and-Go Cup Stream

An adult makes one smooth hole near the lower side of a sturdy paper cup. Let your toddler cover the hole with one finger while the adult pours a small amount of water into the cup over a sink, bathtub, or outdoor tray. Remove the finger and watch the stream start. Cover the hole again to stop it.

This one has a very fast payoff, so expect a lot of covering and uncovering the same hole. Keep the cup over a sink, tub, or tray so you aren't tense about the mess. An older toddler may start trying different finger positions or asking for another fill as soon as the stream stops.

Why it works: The finger temporarily blocks the water's exit path, so covering and uncovering one opening controls the flow immediately.

Age range tweak:

• 18-24 months: Let an adult hold the cup while the child covers and uncovers the hole.
• 24-36 months: Let them repeat the stop-and-go stream and compare a fuller cup with a nearly empty one.

5. Large Lid Spin Test

Set out two or three large plastic container lids. Spin one on a smooth table, then another. Try spinning the same lid flat, on its rim for a moment, or with a gentler push. Keep every lid large and free of detachable parts.

Large lightweight lids are easier for little hands to start and stop, and they don't disappear under furniture as easily as tiny tops. Let your child choose which lid goes next, then return to the same one with a gentler or stronger push. The wobbling at the end is often the part they watch most closely.

Why it works: Shape and the strength of the push affect how the lid rotates and how long it keeps moving.

Age range tweak:

• 18-24 months: Spin the lids for them and let them stop or restart the motion.
• 24-36 months: Let them spin large lids themselves and compare strong and gentle pushes.

6. Pour-Height Splash Test

Put one wide empty basin inside a bathtub or on a washable outdoor surface. Give your toddler one small cup of water. Pour from just above the basin, then from a little higher while keeping the height safe and manageable. Compare the splash.

A bathtub or outdoor spot lets your kid enjoy the splash without you flinching every time water leaves the basin. Keep the two heights clearly different but still low and safe. If they start experimenting with the pour angle too, let them; the splash changing is what keeps the activity alive.

Why it works: Water gains speed as it falls farther, so a higher pour usually makes a bigger splash.

Age range tweak:

• 18-24 months: Keep the cup very low and help with both hands.
• 24-36 months: Compare two clearly different but still low and safe pouring heights.

7. Sponge Stack Squish Test

Stack one large kitchen sponge on a towel and place one lightweight plastic tray on top. Let your toddler press down with both hands and release. Add a second large sponge underneath the tray and press again. Keep changing between one and two sponges and watch how far the tray moves and how the sponges spring back.

The tray makes the movement easier to see than pressing a sponge by itself. Let your child push, release, and watch the stack spring back, then swap between one and two sponges. Toddlers who like heavy-work play may happily repeat the same press far longer than you'd expect.

Why it works: Sponges compress under pressure and expand again when the pressure is removed, while adding another sponge changes how much the stack can squish.

Age range tweak:

• 18-24 months: Use one large sponge and help with one gentle two-hand press and release.
• 24-36 months: Compare one-sponge and two-sponge stacks and let them reset the tray after each press.

The Bottom Line

The activities that hold a toddler often have an easy reset built in. Something falls, spins, splashes, squishes, or starts moving, and your child can make it happen again before the excitement wears off.

If they repeat one part far longer than you expected, that's useful information. You just found the kind of action their brain wants more of today, and you can usually get more mileage from repeating it than from rushing to the next activity.

Want to have these ideas in one place, customized for your kid in just a click? Grab our free Screen-Free Activity Finder.

One mom told us: "I work from home and needed to get through a mountain of emails. The finder gave me 'Sensory Rice Bin.' Poured some rice in a bin with cups and spoons, buried a few toy dinosaurs. My 2-year-old played with that thing for over an hour. She was scooping, pouring, burying, digging - completely focused. When I finally looked up from my laptop she had sorted all the dinosaurs by size. She taught herself something while I worked."

The Screen-Free Activity Finder is free. Put your email in below and we'll send it over.