I think this link will help you a great deal.
http://mm-gerbils.tripod.com/id10.html
Since I'm owner of an animal rescue & care network, I completely understand that you want babies, but are you really, 100% positive that you have homes waiting for each one? Good homes?
Many have forgotten this truth, but you must not forget it.
You remain responsible, forever, for what you have tamed.