I’m mid-clerkship, and here’s what I found helpful so far:
Podcasts.
Pediatric Emergency Playbook. PEMPlaybook.org Your best bet. This is a great podcast by UCLA-based Tim Horeczko, MD. He digs into topics for about 1 h at a time. It’s pretty engaging, and brings in cases, the latest research, and lots of clinical pearls. Many of the topics are high-yield, such as diarrhea, syndromes, otitis media, and strep throat.

Peds in a Pod. This one is by a few fun residents and some attendings. They are making it to review for the pediatrics boards. The episodes vary in length and quality, and are generally pretty good.

Peds Cases. More variable in quality. PedsCases.com. Mostly pretty short.
Books
I’m using BRS Pediatrics as more of a textbook, and I like Pre-Test Pediatrics and Case Files: Pediatrics for lots of questions and for cases followed by questions, respectively.
Special things to bring with you
I clipped a little stuffed animal penguin on my stethoscope. Kids like it and parents think it’s cute.
Stickers are good to stash in your white coat.
As always, stock up on alcohol swabs, and always have a trusty penlight, lots of pens, highlighter, stethoscope, and maybe even a tuning fork. I like a White Coat Clipboard and/or small legal pad too.
I also snagged one of these $2 cards to go on a badge reel with normal vital sign ranges for the various age groups you will see and developmental milestones (can find on eBay, Amazon, etc):
https://www.scrubpocket.com/Pediatric-Vital-Signs-Badge-Card-p/10015.htm