Child VS Adult nursing for nurse practitioning-HELP

Since i don't think i want to work in the neonatal unit does it mean i won't be able to transition.

you could find a uni that does dual training, or pick a branch, adult if you want to be a practice nurse (in a GP's surgery, which personally I think is quite limiting) or any other adult nursing role, or child branch if you want to work specifically with children aged 0-18 years. To work in both fields without dual registration you would have to do another 2 year postgrad diploma which you would have to fund.
I don't know how old you are or which year you are thinking of applying in but I do think that you need to get some work experience in both branches.