That depends on your setup.
Like already mentioned above. If you have fishes that will hunt small critters, the odds increases with hiding places the fishes cannot reach.
In a shrimp only tank. Your filtration system must have a protected input to prevent babies from being sucked up. Some biofilm and algae are necessary for the first 2 weeks, then the babies will have a go to bigger food particles.
In a Fish tank. If you want, you can raise the babies 3 weeks in a nursery, with a clump of moss and feeding powdered food, then release them in the tank during night time and complete darkness.