Positive   Negative Mercury in (mother´s hair) Parity**, mother´s alcohol consumption during pregnancy*, mother is Faroese** Teetotal mother*, father´s school education, weight gain during pregnancy* ß-HCH (in breast milk) Maternal age**, mother´s weight**, BMI**, mother´s alcohol consumption during pregnancy**, father´s profession*, father´s occupation*, previous infertility*, complication under birth** Weight gain during pregnancy, teetotalling mother**, mother is Faroese**, weight gain during pregnancy*, OOS** HCB   (in breast milk) Maternal age**, mother´s weight**, BMI**, father´s profession*, mother is Faroese*, parity**, complication under birth* Father´s school education, weight gain during pregnancy**, OOS* S PCB (in breast milk) Maternal age**, parity**, father´s profession**, mother is Faroese**, previous infertility**, complication under birth* Father´s school education**, weight gain during pregnancy**, OOS* 4,4´-DDT (in breast milk) Maternal age**, mother´s weight**, BMI**, father´s profession**, father´s occupation**, mother is Faroese**, parity**, complication under birth* Weight gain during pregnancy** 4,4´-DDE (in breast milk) maternal age**, mother´s weight*, BMI**, parity**, father´s profession**, mother is Faroese**, previous infertility*, complication under birth* Father´s school education**, weight gain during pregnancy*, OOS* Trans-nonachlor (in breast milk) Maternal age**, parity**, father´s profession*, mother is Faroese**, previous infertility** Father´s school education**, weight gain during pregnancy*, OOS** Musk xylene (in breast milk) Mother´s weight**, BMI** **: Correlation is significant at the 0.01 level (two-tailed). *  : Correlation is significant at the 0.05 level (two-tailed).