Here's what I think..lol
The mom is a double rex and the dad is a standard coat so every baby from that pairing should be a rex, unless of course the hairless gene comes into play.
Rex's can show some bare skin especially around molt so I bet the baby is just a rex and the hairless areas will fill in as it ages.
I have some black rex mom's that I've finally got out of my breedings that always threw ugly rex's that didn't have nice full coats.
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