Don't let your co-workers discourage you, it's great that you are trying to learn the labs. Over the years I've worked with nurses who have that "you should already know this" look perfected.........what I found out is that most of them didn't know. I work in a huge level III NICU and we still have nurses that don't understad labs.
There are a couple of good (I think) reference books. Protocols in Neonatal Nursing
by Carole Kenner, Stephanie Rockwern Amlung, and Ann Applewhite Flandermeyer. The book costs about $45 (or $20 used from Amazon
.com) and is over 700 pages. It's a paperback and doesn't take up too much room. Also, Comprehensive Neonatal Nursing
by Carole Kenner, Ann Brueggemeyer, and Laurie Porter Gunderson. It's pricey, right at $115, 1200+ pages of just about anything you can run across in an NICU. It's one of those weight-lifting text books like you carried in nursing school. Both have lists of common lab values.
If I remember right, a few years ago Neonatal Network
ran a good article about CBC's explaining what abnormal results meant. Would your lab have a list of neonatal norms that you could copy?