I would recommend that you just stay put at the Embassy Suites @ South Park! The Concord area is NOT worth the move, especially w/ a child!
At South Park...there are several restaurants encircling the complex.
The "Cheesecake Factory" has a huge menu. The food is okay not great, I find. There are items for children. There is also a food court within the South Park Mall.
If you are travelling towards Concord Mills on 485 from Charlotte, exit onto Rea Rd. and go to the Stonecrest shopping complex on your right as you exit. (The concierge can direct you on surface streets to Stonecrest.)
You could have lunch/dinner there:
Firebirds Restaurant - American fare.
Qdoba Mexican Grill - order your food up front; and take to your table. Outside seating as well.
China Bistro - directly next door. Maybe get a chicken dish for your child.
Marble Slab Ice Cream - next door as well.
There is a Target store in the complex, which has a variety of things. 'Might be of interest to you?!
For an activity:
You could also try the Schiele Museum below. I believe they have a Planetarium. It is located just west of Charlotte in Gastonia.
I think they have interesting things to keep the kids entertained.
1500 East Garrison Blvd.
Gastonia, NC 28054
Phone: 704-866-6900
There is really not a lot to see/do in Charlotte.
Check out the North Carolina Trip Advisor forum for Wilmington for restaurants there. Eat at one of the many that are located along the riverfront. "Quant town.