Best place to get advice is from midwife! he or she will have most of the answers.
I think as long as the cage isn't too close to the crib so dust, seeds and poop can't get to the crib it'll be fine. justr make sure you keep on top of keeping and cleaning up after the budgie.
Have fun and good luck with both of your new bundles!
Always a loving slave to Joey, Abbi, Diesel and scoobie. Also to a growning number of zebra finches.