It's definitely a lunch place. If you are looking for something for your noon meal which would be considered a main meal of a day, you would probably be better off somewhere else. However, you shouldn't go away hungry from this place, and you can always order more. They have sandwiches which are open faced, but they do closed ones as well. Usually they do soup. I think they usually have meatballs and potatoes (think Ikea lunch), hotdogs, or another savoury dish. They usually have a few choices of salads and at least 3 different dessert choices. Their regular filter coffee is great and served in these really cool mugs. You order at the counter and seating is very casual, and having your child on your lap would be no problem. I'd suggest you try to get a seat away from the groceries as people do actually shop there.
Plus you can pick up some Scandinavian groceries. I really recommend stuff like cloudberry or lingonberry jam (the latter is treated like cranberry sauce and served with savoury dishes), some of the licorice (especially the Turkish Pepper candy) if you like that, really awesome cracker bread or Nordic cheeses. I usually end up spending at least as much on groceries as our lucnch.