If you think child nursing is your calling go for it. I'm a medical student and really keen on Paediatrics. However, I would be cautious to go straight into working with children. This might mean you'll have to practice clinical skills and patient skills straight away with children (and parents!). Even though I'm interested in Paediatrics, I'll have to do medicine more generally and work on general wards before I can specialise which will allow me to practice my skills with adults and gain more experience. Maybe this is something you could do too?