Perinatal mortality and congenital anomalies in babies of women with type 1 or type 2 diabetes in England, Wales, and Northern Ireland: population based study.

Objective: To provide perinatal mortality and congenital anomaly rates for babies born to women with type 1 or type 2 diabetes in England, Wales, and Northern Ireland.

Design: National population based pregnancy cohort.

Setting: 231 maternity units in England, Wales, and Northern Ireland.