The following sites may help you better understand what your child is experiencing, how to seek support for them (and yourself!), and their healthcare needs.

Celiac Disease Foundation

The Kids Korner area is dedicated to providing parents with helpful information for children and teens diagnosed with Celiac Disease.
http://www.celiac.org/kidskorner.php

Children's Digestive Health and Nutrition Foundation's Celiac Disease site

If you are the parent of a child with Celiac Disease, or if you are a teenager or kid with Celiac Disease, this site will help you learn everything you need to know about Celiac.
www.celiachealth.org

Dear Parent (Celiac Sprue Association)

Suggestions on how to get the most out of CSA materials and encourage a positive learning experience for your child at school.
http://www.csaceliacs.org/SchoolMaterial/Parent.php

For families (Coeliac UK)

There are many ways in which Coeliac UK can guide you through initial challenges and provide you with support as your child gets to grips with the gluten-free diet.
http://www.coeliac.co.uk/for_families/default.asp