@John *******
it's nothing personal we decline a LOT of posts which we usually provide the answer in the notes on why we declined it
As I told you if you haven't gone thru family court and gotten the "legal parental rights" decree issued (a process that takes about 6 months to do if the case is uncontested <- as in the thai mother is okay with it) you can't use being the parent of a thai child born out of wedlock to get a yearly extension.
Having your name on the birth certificate, even if your child has a passport from your country does NOT give you legal parental rights in thailand to use the support of the child as a means to stay here on a long term (yearly extension)
You can get a 60 day visit thai family extension, that's it.
SO if you're wanting to switch from being on a retirement extension to one based on raising/supporting a thai child you and your child's mother need to go to the local family court in your province and see what's involved in filing a parental rights case.