Can my son on a student visa travel abroad and return to Thailand without issues?

The user is inquiring if their son can travel abroad during Christmas on his student visa, which requires renewing every 3 months. The comments clarify that the visa is actually an extension allowing a 6-month stay, and that he can travel if he gets a re-entry permit, either at the airport or immigration office prior to leaving. It's important to note that if he stays in Thailand for over 90 days without leaving, he must file a 90-day report, which can be done by someone else on his behalf. The discussion addresses procedures and costs associated with the re-entry permit.