Reddit mentions of Nelson Essentials of Pediatrics: With STUDENT CONSULT Online Access

Trust the process. You'll learn what you need to learn.

BRS is nice and dense, but somewhat outdated.

Your best resource, by far is going to be Pediatrics in Review (and for NICU, NeoReview). They provide excellent review articles for any topic you might wish to learn about. Read these articles often.

Nelsons is the reference "bible" if you will, but I don't know if I'd drop the dough on paying for a full Nelson's. Nelson's Essentials on the other hand, is quite digestible.

You mentioned Pocket Medicine, and there is a Pocket Pediatrics, but I've never used it. Harriet Lane is definitively the standard reference but a bit thick to stick in a white coat pocket (every halfway decent program has like 4-5 of these strewn about the resident work-room).

The good news is, you can sort of pick and choose what reference texts you want. For board prep you'll get the usual "laughing your way", PREP, and medstudy, etc. I also think it's not a bad idea to pick up a text correlating to your field of interest.

For instance, I like critical care. So I picked up Roger's Handbook of Pediatric Intensive Care (the much more portable version of the larger text).

Hope that helps!!