Aww that's a bit of weird feedback not alot you can do about that really, maybe it came down to you and another candicate and they just had to really nit pick, hopefully you'll be in a good position this time around and you'll have some experience of the interview process under your belt so fingers crossed
That would be great if you can get on the children's ward, I've applied to be a paediatric play volunteer so I'm hoping I hear back soon