Handling back-to-school separation anxiety
Carrillo said a lot of times separation anxiety is caused by fear of the unknown. Parents may talk excitedly about kindergarten, but unless they explain what it’s all about, the child may be at a loss when they’re dropped off in their new classroom.
(Visalia Times-Delta)
That link died. Here’s another, similar article: http://www.parenting.com/gallery/how-to-deal-with-school-separation-anxiety