You've received great advice above. smile I'll just add a few resources and suggestions...
Originally Posted by Isabel
Any book you can recommend? Any suggestions?
Reading material:

Book...
A Parent's Guide to Gifted Children, by James Webb PhD, et al
(Dr. Webb is the founder of SENG, also Great Potential Press)

Websites...
- Supporting the Emotional Needs of the Gifted (SENG)
- Hoagies' Gifted Education Page
- Davidson Database
- Gifted Homeschoolers Forum (GHF)
- Mensa for Kids

publishers...
- Great Potential Press
- Prufrock Press
- free spirit publishing
- Magination Press, APA

roundup of topics frequently discussed on the forums...
(The "roundup of common Behavior characteristics and early milestones which may indicate giftedness" may be of particular interest.)

Suggestions:
1) Follow your child's lead
- When your child is young, this usually means: don't push or "hot-house" or "Tiger parent."
- When your child is older, this usually means: don't over-protect or be a "helicopter parent" or a "lawn-mower parent."

2) Document
- Keep dated records at home in a safe place regarding what your child does... including lists of books read, interests, classes, camps, projects, etc.
- In the future, selected material from this collection may used to...
--- track trends,
--- build a portfolio,
--- apply to a program, camp, class, or volunteer service opportunity,
--- provide an inspiration and/or theme for a college admissions essay.
- When your child is older, he can take over the task of documenting his learning experiences, achievements, and accomplishments.