Better you check something like this on thaiviasa.com but this was a good answer to the same question.
Quote:
Your baby will be an alien child and get a special birth certificate that says it. He can be entered into a house registration if you know someone at the local amphur office, but the child is NOT a Thai citzen and must have a visa just like any other foreigner.
As long as your visas are up to date, no worries about the new baby until the new baby makes his first trip outside of Thailand. He will need a passport to leave and if he wants to come back, he will need a visa.
Thai nationality is only passed on when a parent is a Thai national.
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