TIMEX Kids' Analog White Dial Boy's Watch-T781419J

what's the tightest setting it can be? he is five but has crazy tiny wrists.

We lost the band - its it possible to just buy another band?

Arrived not working. Do I need to do something to get it to start?

The band won't stay tight on this watch. Does anyone know how to fix it with velcro that does not involve a sewing machine?