The full name of hib is Haemophilus influenzae type B vaccine, which needs to be categorized into four times, three times, and one time depending on the time of starting the vaccination. 1.four times type: if the vaccination starts 2 to 6 months after birth, it is necessary to be vaccinated three times in 2 to 6 months. After that, one additional vaccination should be given at 15 to 18 months, so the total number of vaccinations is four, which belongs to the four times type of Haemophilus influenzae type B vaccine. 2. Three times type: If the vaccination time is from 6 to 12 months of age, it is necessary to be vaccinated twice from 6 to 12 months of age, with an interval of one month to two months each time. After that, a booster shot will be given at 18 months of age, for a total of three shots, which belongs to Hib vaccine type III. 3. One-time type: If the start of Hib vaccination is after the age of one year, one-time vaccination is sufficient. Hib vaccine can prevent meningitis, pneumonia and other diseases, and parents need to do a good job of vaccination. Vaccination should be done according to the doctor’s recommendation, and you should not choose the vaccination schedule or the number of doses on your own.