So, you have a couple of options, either a Labor and Delivery Nurse, caring for moms and babies; a NICU nurse, which is intensive care for very small babies, usually premies; or a pediatric nurse, on a peds floor that usually cares for kids of all ages, toddler up through teens.
Again, look at the programs at the schools you are interested in. There should be descriptions of the programs, and in the course catalogue the prereqs for each nursing course. Also, every school I know of has an advisor to guide you through the steps for pre-reqs and applying.
In general, you'll need English composition, algebra, possibly statistics, biology, chemistry and organic chemistry, some social study hours, psychology and anatomy & physiology. Our A&P requires biology first, etc.