I have done something similar.

And I will agree that you should keep the little one in a separate hospital bin,
The melafix is a good antibacterial, if there is any broken skin I would use triple antibacterial ointment with out pain killer.

Since the little one has broken bones I would dust its food with calcium with D3 at least every 2nd feedings and a multi vitamin
once a week to help.

Good luck.

and post picts we love to see the little one improving