Results
We recruited 227 women with 210 eligible for analysis. Of these women, 146(70%) were diagnosed with recurrent GDM. We found a 19% reduction in the risk of GDM in a subsequent pregnancy if a woman breastfed for more than six months (RR 0.81, 95% CI 0.68–0.96) after adjusting for both age and BMI. In a fully adjusted model, the association was attenuated (RR 0.89, 95% CI 0.78–1.02). With the same adjusted confounders, however, both high intensity breastfeeding (2 h OGTT,P = 0.01) and breastfeeding for greater than six months (1 h OGTT, P = 0.01) were associated with a mean blood glucose decrease of 0.7mmol/L.