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A toddler drops a household item into a bowl of water inside a storage bin while testing sink or float.
ThinkingTest And CompareIndoor

Sink or Float.

Turn a bowl of water and a handful of household objects into a toddler-sized science lab. Your child predicts whether each object will sink or float, drops it in, and checks the result to practice testing ideas and comparing outcomes.

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
Set a bowl inside a storage bin and fill it halfway with water.
Step 02
Place a few household items that can safely get wet inside the bin around the bowl.
"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. 01
    Have your child choose one item and guess whether it will sink or float.
  2. 02
    Have them drop it into the water and watch what happens.
  3. 03
    Take the item out, name whether it sank or floated, and repeat with another item.

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.
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
  • Noticing what objects do in water, the bath, or outside puddles.
  • Trying one idea, watching the result, and adjusting the next try.
  • Talking through simple predictions during play.
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.

Parent questions

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Keep playing

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