Do children need a visa extension when staying in Thailand, or will they be penalized for overstaying?

A user is inquiring about the necessity of visa extensions for their children, who are all under 10 years old, while they are planning to get a 30-day extension themselves. They have been informed that the children may not require extensions due to their age, raising concerns about potential issues if they re-enter Thailand later. Commenters clarify that while children under 15 may not be fined for overstaying, it's still advisable to ensure they have the proper visas or extensions to avoid complications, especially if intending to stay longer or attend school.