About 2-5% risk for a man's risk too have a child with type 1 diabetes. Exclusive breastfeeding for up to a year seems to be protective in some research studies too. The risk reflects what genes may be passed along to any babies you have and would be modified if there was type 1 diabetes or other autoimmune problems like thyroid disease in either your or his family. Most think this is still relatively low risk but obviously higher than if he did not have type 1 diabetes.

Stuart Brink