In and Out — Shape Sorter, No Rules

For babies around 10 months old · Fine Motor · Spatial Thinking · Cause and Effect

Why this week matters

At 10 months, your baby is deep in what child-development experts call the "containment" phase: putting things in, taking things out, and doing it again and again. This repetition is serious brain work — it builds spatial understanding, hand control, and early problem solving. A shape sorter is the classic toy for this stage, but here's the secret: your baby is not ready to match shapes to holes yet, and that's fine. This week is about free exploration, not getting it right.

This week's activity: In and out, your baby's way

You'll need: a shape sorter, or any wide-mouthed container (a big steel dabba, bucket, or shoe box) with 4–6 safe objects that fit inside.

If using a shape sorter, remove the lid or use the open side so every shape fits through easily. No forcing shapes into matching holes this week.
Sit with your baby, drop one block into the container, and shake it: "Listen! It's inside!" Then tip it out dramatically.
Hand your baby a block and wait. Some babies drop it in immediately; others mouth it, bang it, or throw it. All of this is learning.
When your baby drops something in, name it simply: "In! The circle went in." When they dump it out: "Out! All out!" These little words build vocabulary alongside motor skills.
Let the game run as long as your baby is interested — even if that means twenty rounds of the same thing. Repetition is how this age learns best.

Make it your own: Cut a large hole in a shoe box lid for a "posting box" with soft balls or blocks. Or give your baby a katori of large pasta shells and a steel glass at snack-time distance — transferring is the same skill in a new costume.

What your baby is learning

Spatial reasoning — understanding inside, outside, empty, and full is the foundation of later maths and logic.
Voluntary release — letting go of an object on purpose is surprisingly hard; dropping blocks into a container is perfect practice.
Cause and effect — drop it in, hear the clunk, tip it out. Predictable results teach your baby how the world works.
Focus and persistence — repeating a chosen "experiment" many times stretches your baby's attention span.

Make it easier with Kizoplay

Shape Sorter — ₹1235. A beautiful wooden sorter that grows with your baby — open-ended in-and-out play now, true shape matching in the toddler months ahead. Shop now →

Good to know

Choose objects bigger than your baby's fist and always supervise, especially if you use food items like pasta shells. If your baby only wants to dump and never fill, don't worry — dumping usually comes before filling, and both are exactly on track. Every baby develops at their own pace; follow their lead and keep it playful.

This is Week 41 of the Kizoplay 52-Week Play Series — one simple, science-backed activity for every week of your baby's first year. Explore all our Montessori play kits at kizoplay.com