Here are my three suggestions..... I have all three, and couldn't function as a new nurse without them.
1: Care of the Sick Neonate - [can't remember author] great book that boils down most conditions and procedures related to NICU into a smallish spiral bound book. It's great to keep next to your charts.
2: NeoFax - Its a NICU-specific drug book. It covers almost all meds you will ever give in NICU, and their interactions with other meds. It also includes baby-sized dose ranges.
3: Core Curriculum for Neonatal intensive care nursing - Great PB text that deals with almost all neonatal conditions in depth. Also gives procedures, labs and some radiographic interpretation material.
I pretty much keep #1 and #2 with a calculator at my desk all night, and use them all the time. #3 I keep in my locker when I need to look something up. Hope this helps! Try Amazon