I am an Australian nurse working in MA. It is possible to do these courses..........i didnt need to do peds as i had enough hours, but i did have to do obstetrics. I did this externally through Otago poly tec in New Zealand. It cost around 1000 dollars and it was basically a work book and i had to sort out a 2 week placement. I ended up not having to do the placement because i was able to show that i had done maternity placements through uni.
Message me if i can be of any help to you with the whole process, it is very confusing!