What kind of household items work best?

Use a few objects that look and feel different from each other and can safely get wet. If one item is too small or too fiddly, swap it for something easier to see and handle.

What if my child will not guess before the drop?

Skip the guess and let your child do the test first. You can say the result after the item lands and keep the round moving.

It can splash, which is why the bowl sits inside the storage bin. Keep the water about halfway up the bowl and use only a few items at a time.

Back to library

ThinkingTest And CompareIndoor

Sink or Float.

Use a few big safe items and do one quick round: guess, drop, check, repeat.

A simple water bin activity where your child guesses sink or float, drops one item at a time, and sees what happens.

ThinkingTest And CompareIndoor

Sink or Float.

A simple water bin activity where your child guesses sink or float, drops one item at a time, and sees what happens.

Play time

5-15+ min

Age

2 years

Energy

Low

Mess

Medium

Effort

Low

Where

Indoor

Start here

The recipe.

Low parent effort

4 things

What you need

1 sensory bin or storage container
1 bowl
Water
A small handful of household items that can safely get wet

5 min minimum

Setup

Then start the loop

Step 01

On the floor or a low table, put the storage bin in front of your child and set the bowl in the middle.

Step 02

In the bowl, add water until it is about halfway full so drops are easy to see without sending water over the edge.

Step 03

Inside the bin around the bowl, spread a few safe-to-get-wet household items where your child can reach them.

"Sink or float?"

The loop

How play unfolds.

A toddler chooses one household item, drops it into a bowl of water, watches the result, and reaches for the next test item.

1
Hold up one item and ask, "Will it sink or float?"
2
Let your child guess with a word, point, or look, then drop it into the bowl.
3
Watch what happens and say the result together.
4
Move the tested item to the side, pick a new one, and repeat. When everything has had a turn, spread the items out again for another round if your child wants.

01
Hold up one item and ask, "Will it sink or float?"
02
Let your child guess with a word, point, or look, then drop it into the bowl.
03
Watch what happens and say the result together.
04
Move the tested item to the side, pick a new one, and repeat. When everything has had a turn, spread the items out again for another round if your child wants.

Safety Check

Stay with your child during water play.
Skip small items if your child still mouths objects.
Use only items that can safely get wet and safely hit the bowl without breaking or splashing hard.

Supporting the play

What to say in the moment

Match what you say to what you see.

Prompt ladder

Level 1 (Start)

"Pick one. Sink or float?"

Level 2 (Keep going)

"You checked it. Grab another."

Level 3 (Stretch)

"What do you think this one will do?"

Level 4 (Extend)

"Can you find one that might do the same thing?"

If your child seems...

What you'd see

Focused

What to do

Say

"You saw what happened."

Add

Ask, "Same or different?" after the item lands.

Extend

Let your child choose the next item for your turn.

Make it easier

Younger end

-Use only items that look very different from each other.
-Let your child skip the guess and go straight to the drop.
-Do one round with you choosing the item and your child doing the drop.

Make it harder

Older end

+Ask for the guess before the item gets near the water.
+Let your child choose the next test item without help.
+Ask your child to find another item they think will do the same thing.

If it's not working

If you see

If child ignores it

Do one fast grown-up turn and say, "I think this one will float. Let's see."

If you see

If child misuses it

Keep the extra items beside you and hand them over one at a time.

If you see

If child gets frustrated

Skip the guess, let your child drop the item first, and say the result together after it lands.

Skill spotlight

Test And Compare

Testing what happens, then comparing the result

This helps a child notice what happened after an action and use that information on the next turn, which matters in everyday play, water exploration, and simple problem solving.

•The guess -> drop -> check loop helps your child test one idea at a time and watch for a clear result.
•Repeating the same round with new objects builds simple compare words such as sink, float, same, and different.
•Dropping one item at a time gives easy practice with hand control and starting the next turn.

Real-world transfer