Can a B visa be converted to a tourist visa in Thailand without leaving the country, and do children under 16 need a visa?

The post discusses two main questions regarding visa regulations in Thailand. The first question asks whether a B visa can be converted to a tourist visa either by going to immigration or if one must leave the country to change it. Additionally, the second question inquires if children under 16 need a visa to reside in Thailand. Community responses suggest that a B visa can often be converted at immigration, but it may depend on specific circumstances, including the visa type and the individual's nationality. Regarding the second question, it is clarified that foreign children do need a visa to stay in Thailand but are not penalized for overstaying until they reach certain ages.