VY have A319s (or an A319 and more coming), these are ex IB, I believe. As is much of the VY fleet, presumably there are more where those came from. Of course Baby becoming part of Vueling may not be a good thing for staff, Im sure Vueling's T&C's are much lower cost than Baby's, with their inevitable mainline baggage. How staff would be assimilted into VY would be far from clear, if they would be taken on at all.
Unfortunately for the guys and gals at Baby and Regional, these are very uncertain times. I feel sorry for them, the lack of certainty must be the worst. At least if they knew what was to happen they could plan accordingly.