Reddit reviews Batman: The Brave and the Bold

Marvel put out some great comics under the "Marvel Adventures" label that are great for younger readers. My favorite is Marvel Adventures: Avengers. Another are the Power Pack books. All are collected in nice digest-sized collections perfect for kids.

From DC, the trade paperbacks of Tiny Titans are worth tracking down, and there's a collection of the terrific Batman: Lil' Gotham coming out soon. My nephew is a huge fan of the Batman: Brave and the Bold cartoon, so I've been getting him some collections of the related comic series as birthday gifts. I also got him a copy of the DC Super-Pets Encyclopedia, and it was so cool I ordered my own copy.

Here are a few suggestions:
Batman
Batman and Green Lantern
Batman and the Flash
Tiny Titans

There are also Batman: The Brave and the Bold books written for children

Good luck OP!