[LEAD] Being afraid that Thailand will be flooded by the huge number of migrant?s children, the Minister of Labor has proposed a birth control plan [for the migrants]—sending the pregnant labor back. The remark was made without fear to be condemned. It was revealed that the number of illegal labor force is not less than 1 million. [The government] should speed up the framing guideline.NGO slams[the idea] for going backward, suggest better family planning campaigns. [Body] Mr. Chalermchai Sri-on. The Labour Minister is preparing to set up a measure to control the unregistered migrant labor. The Minister revealed thatthe Migrant Labour Administration Committee had considered to seek appropriate measures and set up principle [to deal with migrant workers