Wemberly Worried (2000)

Wemberly the mouse worries about almost everything, and her first day of school tops the list. Kevin Henkes treats her fretting with warmth and humor rather than alarm, and the turning point is simple and true to life: her teacher introduces her to another girl, Jewel, who is just as worried, and the two find each other. For a child who is a natural worrier, it shows that plenty of other children feel the same and that a friend makes worries shrink, without suggesting any new things to be afraid of.