Objective: The aim of the present study is to investigate the duration of breastfeeding in relation to various parafunctional oral habits in children with anxiety disorders. Materials and Methods: The study includes 195 children and adolescents with anxiety disorders and age- and gender-matched 255 healthy control subjects. Diagnoses were made with semistructured interview (K-SADS). Information about breastfeeding and parafunctional oral habits was investigated via a questionnaire prepared for the study. Results: The mean age was 11.502.50 years for clinical group and 11.27 +/- 2.33 years for controls. Fifty-four percent of the clinical group and 56% of the control group were female subjects. Duration of exclusive (4.72 +/- 2.86, 5.55 +/- 2.36; p=0.002) and total breastfeeding (12.38 +/- 10.32, 15.89 +/- 9.09; p<0.001) was significantly lower and duration of bottle-feeding (22.30 +/- 19.54, 16.64 +/- 12.79; p=0.005) was higher than controls in the clinical group. Duration of exclusive breastfeeding was significantly correlated with duration of bottle-feeding (r=-0.263, p<0.001) and duration of pacifier use (r=-0.249, p=0.001). Multiple regression analysis showed that duration of exclusive breastfeeding (=0.88, p=0.006) and bottle-feeding (=1.02, p=0.005), as well as various oral habits, was associated with diagnosis of an anxiety disorder. Conclusion: Nutrition methods in early years of life may result in long-term consequences regarding anxiety disorders for children. Clinicians should encourage parents for a shorter duration of bottle-feeding and a longer duration of exclusive breastfeeding.