Nonetheless, many people with type 1 diabetes have gone and had children.
The Finnish study of type 1 diabetics' says they have between 2/3 and 3/4ths as many children as non-diabetics, and that the difference is smaller for younger folks.
This smallish German study showed less than half as many children being born to the type 1 diabetic parents.
This study on pregnant women showed that the diabetic women (type 1 and type 2) had tried to get pregnant for a longer time period before getting pregnant as compared to the nondiabetic women:
This Swedish study found that type 1 diabetic women had 4/5ths as many children as non-diabetic women BUT that if they looked only at women diagnosed after 1985 who did not have complications (and how many such women were there, I want to know?), then there was no reduction in number of children.