Nathalie,
In ideal circumstances we wouldn’t have to use 5-HTP. Unfortunately, there are many children who exhibit low serotonin states just like adults.
I have never seen problems in using 5-HTP in kids would much prefer its use over SSRI medications if at all possible. There are a number of studies showing 5-HTP effectiveness and safety in many children.
Here is one article that discusses this topic – http://www.progressivehealth.com/kids-and-5-htp.htm
Sincerely,
Dr. Woeller