It is normal for a baby and children up to about three years, for five-year-old children it is unpleasant and for older children it can become a complete obsession for themselves and for the whole family. At mature age it often disappears by itself, however there are adults who still wet their bed.
More than 15% of all six-year-olds and 5% of the ten-year-olds are not dry at night. For the category between fifteen and eighteen year-olds it is 1.5% by estimation. It is not exactly known how many adults are struggling with this problem, because this issue is a taboo. Bedwetting occurs with boys twice as much as with girls, a clear explanation is not known.