I let firebelly eggs be in their parents' tank and pick morphed ones to terrestial set-ups. It takes about three months so you're in no hurry. Take a look in the caudata culture, I think there's detailed info about development from egg to morph and how to take care of youngsters. There's also many discussions about the subject here, sorry I can't link now since I can't do it with phone.. If you don't want babies, then I'd say collect away as much as you can find (as early as possible) and if they are still eggs, you could freeze them.