Overt diabetes in pregnancy was associated with an increased rate of large-for-gestational-age infant, neonatal hypoglycaemia and shoulder dystocia. Of the 133 patients with overt diabetes in pregnancy who attended a follow-up oral glucose tolerance test at 6-8 weeks post-partum, 21% had diabetes, 37.6% had impaired fasting glucose or impaired glucose tolerance, whilst 41.4% returned to normal glucose tolerance