The following specialist commentators provided comments on a draft of this briefing:
Dr Sam Rice, consultant physician and endocrinologist, Hywel Dda University Health Board. No relevant conflicts of interests.
Ms Rachel Crowley, diabetes specialist midwife, Royal Berkshire NHS Foundation Trust. No relevant conflicts of interests.
Ms Suzanne Hardacre, head of midwifery and gynaecology nursing, University Hospital of Wales. No relevant conflicts of interests.