Some hospitals have internships for students considering careers in nursing. I would call around and look into that.
Also, speaking as a current labor and delivery nurse, don't get so fixated on just one aspect of nursing just yet, okay? There are lots of areas, and besides, I notice that about 80% of nursing students say they want labor and delivery until they see how scary it really is in there, especially when something goes wrong. You may not want it after you see it for what it really is and not what it is on TV.
Nursing is full of neat places to work. I would encourage you to try to see all the areas before you settle on where you want to go first. If you do that and still want labor and delivery, warts and all, great. Anyway, it's great that you want to be a nurse. I hope you continue on that path and we can welcome you into the field a few years from now.