You're not going to get annual extensions based on being the father of a half-Thai child. You're not married, which means you don't have parental rights when the child is born.

To have parental rights, you must be married when the child is born and your name must be on the birth certificate. If neither of those is accurate when the child is born, you have no parental rights. It requires a long time in the courts, and a fair bit of money to a Thai lawyer, in order to obtain those rights.

And even then, you must have custody and be a caretaker of the child in order to qualify for an extension based on a Thai child.

@Adam *****

the normal advice is that the timer resets on each request

They are saying the flight information you provided is too soon. They still not have your visa completed by January 7th so they want to see a new reservation at least 15 working days away from when you applied, but recommend 4 weeks.

@Dave ***

When was that though? There were plenty of reports of that when DTV was new, but things have tightened up a LOT, and the embassies are not so generous anymore.

You generally need a fully outlined treatment plan, including scheduled appointments and planned treatments. The entire treatment should cover at least 6 months, if not longer. Without covering this time period, you would likely be given a multiple entry tourist visa instead of a DTV, as you don't need that much time in Thailand to finish everything.

If you have a DTV then nothing matters. The new guidelines are ONLY for people entering visa exempt, without a visa. You have a visa.

If you want to apply for a 90 day non-O visa conversion from an immigration office inside of Thailand, then yes, it must be an international transfer.

If you are applying for the 1-year extension inside of Thailand, then no, it does not need to be an international transfer.

As always, each immigration office sets their own requirements, so your office might do something different than normal.

If you only had one entry in early 2025 then you are fine in January of 2026.

It's high season right now. Even the embassies that are normally very fast like London are experiencing delays.

Yes, you show both passports. Your visa has a passport number on it, so they want to see the passport that corresponds with your visa. But then since that passport is no longer valid, they will put your entry stamp into the new passport.

You don't need to do anything besides check to make sure you got the correct stamp before you leave the airport. Continue to carry both passports for the remainder of your DTV and you shouldn't have any issues.

Some immigration offices might be willing to put a notation in your new passport that references your old passport number, but even with that it's not a guarantee for entry. The only sure way is to keep both passports.