# If the minimal time gap between the first and booster MMR jabs is 3 months, why is the booster generally given between the ages of 3 and 5? Doesn this expose children to unnecessary risk?

### Related Questions

- If the minimal time gap between the first and booster MMR jabs is 3 months, why is the booster generally given between the ages of 3 and 5? Doesn this expose children to unnecessary risk?
- Since the booster dose of Hib vaccine can be given at 12-15 months, is it still necessary to "boost" two months later if the first dose was given at 12-14 months?
- How much time gap must be given between two batches of broiler birds?