Make sure to ask about the orientation program for new NICU nurses. Ask about typical patient ratios. Find out what shifts they're hiring for, and what kind of schedues they have (3 12's, grid schedule, self scheduling, weekend program).
One thing to be careful about - don't talk too much about how you love babies and children so much. This is an ICU we're talking about, and loving kids and taking care of them when they're critically ill doesn't always mix. I'm sure you're aware of this, but I've seen too many new grads come into the NICU purely out of their love for babies, only to leave a few months later because they couldn't handle the heartbreak that comes with the NICU.
If you are going into the NICU because of specific reasons - personal NICU experience, interest in the ever-changing world of NICU technology and research, etc. then tell the manager about it. It's a great field, and if it's a good fit for you, you'll be so happy once you're part of the team! NICU nurses are amongst the happiest nurses I know. Good luck!