Read what I said, I had to be present or sign a form when he got his first, second and third Thai passport as I was a parent. It's the same if you apply for a passport for your child from your home country, the mother has to sign/agree etc on a form. I got his first Thai passport when he was 6 months too but had to sign a form or be present to sign the form. I was told as the passport office at Buriram that he was not considered an adult until 19 so I had to agree/sign for his passport as his father.