How Young Can You Detect Type 1 Diabetes In An Infant?

Diabetes runs in my husbands side of the family, and he was diagnosed at 11 withtype 1 diabetes. We have a 6 month old baby girl and im just curious as to how early type 1 diabetes can be detected or how early it can occur. I Would appriciate any info on the type of tests that are run to diagnose this in an infant or young child.Thanks!

Can Obese Young Adults Develop Type 1 Diabetes?

Can an obese young adult develop type 1 diabetes and not type 2? I've read unexpected weight loss is a symptom of type 1, so can an obese young adult losing weight without effort and with other diabetes symptoms get type 1?