The vaccination of children helps to prevent many diseases that were once common and are, at worst, life threatening. The youngest children are at the greatest risk of getting these diseases.
Finland started vaccinations in the early 1800s with vaccinations against smallpox, but the country continued to have a high rate of child mortality for a long time.
The Finnish Institute for Health and Welfare (THL) recommends the fourth corona vaccine dose for people aged 70-79 years who belong to a risk group. Risk groups include e.g. people with a severe cardiovascular or pulmonary disease or diabetes. Advanced age and background illnesses increase the risk of serious coronavirus disease, and so the recommendation enables gaining the maximum health benefit.