@Iain *******
, you are totally correct (y)
but the person was asking about getting a Non-O visa and as an unmarried father of a half thai child without going thru family court you can only get 90 day single entry Non-O's from Vientiane or Savannakhet.
Now once he comes in on the 90 day visa he could certainly get a 60 day "visit family" extension after that which would give him 5 months in country on that visa.