Do I Need a Non Immigrant (O-A) Visa as the Father of a Thai Child?

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You need to contact the consulate of the country you will be applying for the visa in, AND a Non-immigrant type O-A visa is for people who are over 50, NOT for people with thai family. You want to get a Non-O visa <- no A after the O.

You will NOT get a long term stay extension in thailand based on having a thai child out of wedlock because when children are born to an unmarried mother 100% of the parental rights is hers NOT the father. Even with your name on the birth certificate and the baby holding a passport from your country, you have no parental rights until you go thru family court and get it granted legally.

You MIGHT <- as in maybe be able to get a 90 day single entry Non-O visa based on having a thai child with just your name on the birth certificate BUT that is totally consulate specific. AND at this time you don't buy the visa first, you apply for permission to enter the country (apply for a Certificate to Enter) and only AFTER you're approved will they let you buy the visa.

Good Luck, contact the consulate where you'll be applying.

First off let's start with your age, your nationality, whether you're married to the child's mother, AND what country you're in where you'd be applying for a thai visa.