Now i know everyone is thinking digital iwatch smart watch but i am hopeful we can pass on the tradition of mechanical watches to our children.
Show examples of watches you started your kids with or watches you have and hope your kids will pass down.
Here are a few example of what are deemed boys size. You may need to move a few links or punch in a few extra holes.
The focus here is traditional in the sense of watches they would be allowed to wear on special occasions not kids swatch watches which could be worn daily.
A few examples in the vintage world.
Tudor
Favre leuba Bovet
I need to hunt down the mini Tudor subs.
Here is a quick group shot with a larger 40mm Rolex to compare size. 
Let see some examples or ideas yo keep the tradition of mechanical watches growing for future generations.