Are the nurses that help deliver babies different from regular nurses (RN not RPN)?

I'm going into nursing (RN not RPN) and I want to help the doctors that deliver babies. What is that hurse called? Are they different than RNs? Do they have to have additional education? Can anyone share all their knowledge on this?

You would go to school to be an RN, but when looking for a job you would want to apply to the Labor and Delivery Ward for a job. Thats all.
My cousin is an RN, currently head RN at a pediatricians office, but when she first started to work she was a labor&delivery nurse at a local hospital. Honestly she just didn't care for the 12 hours shifts, and after awhile found a different job.

Just a normal RN who works on the delivery floor.

The really patient and understanding nurses seem to be hired for this area.

I believe that you are referring to nurse-midwives. Yes, they have different training. They can also be RNs.

I'm not certain about the US, but in other countries, you are an RN first and then take additional training to become a nurse-midwife.

You are still an RN, just with a specialty in Obstetrics (like Abbie was on ER before she became a doctor).
Usually, you would need to get some experience in general nursing first, then get into a maternity ward, then I'm sure there are upgrading courses.
Also, look into midwifery.
When I had my son in the hospital, my main nurse was not only an RN, she was also a midwife.

Where I live it is:
CNA - Certified Nursing Assisstant
LVN - (LPN in many places) Licensed Vocational Nurse
RN - Registered Nurse
BSN - Bachelor of Science in Nursing

Then they are the Master's Degrees and NP's.