BANGKOK, Dec 25 (AFP): Thai authorities have warned doctors they risk losing their licenses if they perform caesarians to insure that a baby is born on the first day of the new millennium. Some parents are pressuring doctors to undertake the operations because they want their baby born on the highly auspicious day. Supachai Khunaratanaphruek, Deputy Permanent Secretary for Public Health, said such surgery would be illegal as it could expose the mother and her baby to unacceptable and avoidable risks.