Pediatric nursing requires a general RN nursing degree in college, so either an ADN (2 year) or BSN (4 year) degree first, followed by getting hired into a pediatric nurse position, either in a hospital, doctors office, PACU, etc.
Make sure you focus on your pediatric clinical and find some good resources in college for peds. Working with kids and families is extremely rewarding, and having some general knowledge of children, like developmental levels, interests, is a plus. I did a lot of babysitting in high school, and was a nanny during college, as well as volunteered with churches in the childcare areas, before becoming a pediatric nurse. Every little bit helps!
Good luck to you, your future is bright no matter which type of nurse you become!