I am assuming the female is at least 8 months old and you know the proper way to introduce them so one doesn't kill the other.
the cage needs to be 1/2 inch x 1 inch ir smaller wire. A baby will walk right out of a 1 x 1 inch opening.
If you leave the male in when the babies are born they will breed again right away and sometimes trample the babies to death in the process so place a small hard container in the cage for the babies to hide in. If you remove the male you will need to watch him closely for signs of depression.
You need to be feeding a good quality feed like Tradition, Mazuri, Show rabbit. Pet store brand chinchilla food will not do.
Good hay should be given everyday even after the babies are born. If you are feeding a good feed no other vitamins are needed. Don't handle mom a lot when she is pregnant. No dust bath for 10 days after delivery.