You buy thisFine motor6–18 moAt home
Stacking rings
The toy on every baby shelf, for a reason.

Stacking ringsView on Amazon
Prep
0 min
Mess
None
How to play
Taking the rings off comes first and is the easy win. Putting them back on is months away — don't rush it. Let him mouth and bang them meanwhile.
What you need
A ring stacker.
What it secretly builds
Fine motorSliding a ring down a post means lining up a hole with a target he can't fully see. That aiming is early hand-eye work.
Safety first
Check the rings are too big to swallow and that the post is short and blunt.