I helped out in the regular nursery (when Peds is slow) which is connected to the NICU. A 4 year old was not allowed in the NICU to see his baby brother, so he was waiting outside with his grandfather. He was interested in everything that was going on, so I explained what the different wires did and that he was being fed by the tube in his hand, etc. He loved it and so did grandpa. I don't think anyone had bothered to try to explain anything to him. It was so cool :)