Doubles come from double seed about 20%, meaning, two double babies from ten seeds. I'll have to start a list! A lot of my plants seem to be starting tiny seed pods, I hope they all grow!
I had a pod last year that was empty. Wow, anticipate for months, then pfffft, no seeds.
New babies I started at the Botannical Gardens where I do volunteer work in the "for sale" nursery. Just pink seeds.