In this retrospective study, pregnant women with type 1 diabetes under the care of diabetes specialists pre‐conception were found to have better glycaemic control and pregnancy outcomes than those not under specialist care prior to pregnancy. These differences were not seen in women with type 2 diabetes. The study showed that tight glycaemic control in women with pre‐existing diabetes was associated with better pregnancy outcomes, and we believe women with type 1 diabetes should be managed by a diabetes specialist before pregnancy.