"Brain fever" usually refers to conditions like Japanese Encephalitis (JE) or Meningitis. The JE vaccine is highly recommended, especially in endemic regions, and is typically given in two doses: the first at 9 to 12 months of age, and the second at 16 to 24 months. Other vaccines that prevent meningitis (such as Hib, Pneumococcal, and Meningococcal vaccines) are started as early as 6 to 8 weeks of age. These vaccines are absolutely necessary because they protect children from life-threatening brain infections that can cause permanent brain damage or hearing loss. Please consult your pediatrician for the exact schedule recommended in your area.