Version 1.116.202.1030
When clicking on a newborn's bassinet and choosing Show Off To..., the only targets displayed are other household members (in this case the young adult spouse, not the infant sibling of the newborn), not any visitors, even if the visitor is in the same room as the newborn. Previously newborns could be shown off to visitors.
Addendum: I could show off to visitors during/after a food sale, but after they left and another visitor showed up, I could not show off to that visitor.