Children with mothers who have allergies or asthma have an increased risk of wheezing in the chest if they take part in baby swimming before 6 months of age. This is shown in a new study using data from the Norwegian Mother and Child Study (MoBa) at the Norwegian Institute of Public Health (NIPH).The results come from a study of 30 000 participants from MoBa. Approximately 25 percent of these children took part in baby swimming from 0-6 months of age.