Suggestion:
Find a Bible that is the translation that you use in your home.
Look for Chapter and Verse numbers in a contrasting color. This makes them stick out in the text. This will really help children to find verses.
Many children like pictures in their Bibles.
The two I recommend for the ESV translation:
ESV children's Bible
http://www.amazon.com/Childrens-Bible-Religion-Crossway-Bibles/dp/1581348924/ref=sr_1_1?ie=UTF8&qid=1346961476&sr=8-1&keywords=ESV+Children%27s+Bible
and the ESV GROW! Bible.
http://www.amazon.com/ESV-Grow-Bible-Esv/dp/1433528746/ref=sr_1_1?s=books&ie=UTF8&qid=1346961555&sr=1-1&keywords=ESV+Grow+Bible
The Children's Bible has great helps in the back from Children Desiring God.
The ESV Grow Bible has questions, connections, and other study helps.
Both have good pictures.