Thank you for asking this question!
When DD was 10 months old we were "advised" to put her in a local private school that takes 18 month olds through grade 8. He didn't mention it was a gifted school. Our DD was only 10 months old at the time, so I could not for the life of me understand why someone would suggest this. DD is now 22 months old and I'm finally getting it. (The "advisor" was a college professor who is a parent of a gifted child.)
I'm only interested in her developing peer rapport at this point, but if someone has experience with gifted preschools I'm all ears.
I'm shocked this school exists in our small community!