-Baby born in Thailand can stay in Thailand until 15 years(Under the law of B.O.I.)
but if they're go out from Thailand should to apply Non-O before arrive in Thailand again.
-Before going from Thailand for apply Non-o in another country. Baby need to get a Guarantee letter from B.O.I. (This process the company must to receive a B.O.I. certificate already and person who want to follow need to submit visa in B.O.I. system already)