I dont know where you are, but in Pittsburgh, there's this great small peds rehab hospital called the Children's Institute. It was started over 100yrs ago as the Home for Crippled children and has now evolved to a rehab hospital, day school, adoption org., and has a Prader Wili Syndrome specialty unit. You should look it up. The site is www.amazingkids.org
You don't need any additional training. They will train you there. Essentially there is 1 charge nurse who does some assessing, gives meds, etc.. and everyone else handles most of the patient care. You will work with Health Care Workers (like CNAs), LPNs, and RNs. All are capable of handling a 4-5 pt assignment with the charge nurse completing the mentioned tasks as well as admissions, etc... The charge nurse schedule rotates between the RNs so you won't be "stuck" passing meds, but will actually get to complete patient care.
They see everything from brain injury to spinal injury to ortho for CP kids to transplants. They even get failure to thrive babies and childrn who are a part of the functional feeder program. I really liked working there when I was in school.