@Mark *********
i would say and take any bet, that you did not get a 60-days extension on a 90-days Non-Imm-O Visa, but you got a "60-days Extension based on Family Visit". With a half Thai child as reason. And you had to exit Thailand before these 60 days stay permit expired. One cannot get the 90-days stay permit out of a Non-O visa extended, except if you meet the requirements for the application to the "1-year extension of stay" either based on family, being married to a Thai wife or being over 50 years old