Questionnaires
| <12 weeks | 20 weeks | 30 weeks | birth | |
| Questionnaire on general habits, socioeconomic factors, lifestyle and eating habits | Recruitment | |||
| Questionnaire on lifestyle during previous 3 days | Urine sample 1 | Urine sample 2 | ||
| Questionnaire on residential facts | 4–8 weeks prior to visit | |||
| Questionnaire on stress factors and birth facts | 3 days after birth |