If you're looking for a gaming mouse, this could be just the thing. Children, or adults with smaller hands, might find that this mouse works well for them.
From Amazon
A4Tech / Bloody BLOODY Bloody V8M PC Mouse, PC/Mac, Built-in Storage Capability, 2 Ways, black, red
Ecprof
A4TMYS43935 - Bloody V8m-V-Track-USB Type-A-3200 DPI-Black