hib refers to Haemophilus influenzae type B conjugate vaccine, and the number of vaccinations varies by age. Less than 6 months of age is vaccinated 4 times, 7 to 12 months of age is vaccinated 3 times, and 1 to 5 years of age is vaccinated once. Determining how many doses of Haemophilus influenzae type B conjugate vaccine are needed depends largely on age and cannot be generalized. The vaccine is given from 2 months of age. For infants younger than 6 months of age, the vaccine is first given every 1 or 2 months for a total of 3 doses, and a booster is given at 15 to 18 months of age for a total of 4 doses throughout the course of the vaccination. For infants aged 7 to 12 months, 2 vaccinations are required at 1 or 2 month intervals, and a booster vaccination is also required at 5 to 18 months of age, for a total of 3 vaccinations. For children aged 1 to 5 years, only one dose is required. Hib conjugate vaccine is mainly used to prevent pneumonia and meningitis caused by Hib. In conclusion, it is recommended to go to a regular hospital to receive the Hib conjugate vaccine, and go to the hospital promptly if you experience any significant discomfort after the vaccination.