i am malaysian,wife is thai,and my baby are born in thai,anyone know how to apply dual citizenship in thailand?do i need to go cheang wattana or malaysia embassy in bangkok?

thanks

You are marreid to Thai national, your child will automatically have Thai nationality. The only requirement is that the birth is registered at the amphur, so the Thai government knows a Thai citizen is born.

For the Malaysian government you need to contact the embassy and registyer the birth of the child there. Most embassies give information about this on their webiste. I don't know if Malaysian law allows dual nationality.