We just found out my 4 year old has type 1 diabetes. Should I be worried about my 8 month old having it too?

3 months after having my 2nd son we found out that my 4 year old had type 1 diabetes. I don't know if I should be worried about my 8 month old having type 1 diabetes too? I really hope not, but if anyone could help it would be great.