The starting position
Where a child is born to unmarried parents in Thailand, parental power generally sits with the mother. A father — Thai or foreign — is not automatically the legal father simply because he is named on the birth certificate or has supported the child.
Legitimation comes first
Before a father can apply for custody or visitation, he normally needs legal parental status. That is established either by registration at the district office with the mother’s consent, or by a court order where consent is not available.
What the court considers
The governing test is the child’s welfare. Courts look at the child’s existing living arrangements, schooling, the care each parent has actually provided, stability, and the practical realities of each parent’s situation — including where they live and work.
Practical points for foreign fathers
Distance is not automatically disqualifying, but it shapes what a realistic order looks like. Video contact, extended holiday periods and travel consent are frequently more achievable than a change of primary residence. FIRM_CASE_EXPERIENCE_NOTE
What to do first
Confirm your legal status before anything else. Time spent negotiating from a position you do not legally hold is usually time lost.