During pregnancy, the paternal and maternal data were collected regarding their reproductive and medical history, social structures, lifestyle, diet, and smoking behaviour before and during pregnancy. Clinical data regarding the pregnancy and delivery were collected from obstetricians, midwives, and general practitioners.
After the birth of the child, information was collected using questionnaires that the parents have to answer about lifestyle, dietary behaviour, physical activity, biological factors, social factors, environmental influences, and illnesses.
Anthropometry measurements were performed by youth healthcare practitioners and provided data regarding weight, height, head, hip and waist circumference, and blood pressure.
Additional measurements were performed in cohort subgroups. These measurements could involve urine samples, blood samples, GWAS, methylation analyses of cord blood, and physical activity measured with accelerometers.