As you can see, protein has a lot of important roles in a kid's diet. Here are some of my favorite sources of protein for children's lunches like Seafood pot-au-feu.

1. As you can see, protein has a lot of important roles in a kid's diet. Here
are some of my favorite sources of protein for children's lunches like
Seafood pot-au-feu.
Nitrate-free deli sandwich meats
Deli meats such as ham or turkey are an easy way to boost protein
intake. I choose the all-natural brands of deli meats. A few of my
favorite nitrate-free options are Hormel Natural Choice and Applegate.
They contain 10 to 12 grams of protein per 2 ounces of meat for only 50
calories.
Greek yogurt
The Chobani Flip is brilliant! It includes a flip-up top with a little
compartment of dry ingredients that are delicious mix-ins to that
specific yogurt flavor.
Cheese
Cheese is another great way to boost protein intake, and most kids love
it. It can also work well because there are so many great on-the-go
cheese snacks made with 100 percent real milk that are available in
grocery stores. Most provide about 5 to 6 grams of protein.
Hard-Boiled Eggs
These are very popular at my house, and my kids will even make them
on their own (with an adult in the house, of course). One hard-boiled
egg provides 6 grams of protein.
Source: Yahoo Health Articles – August 2013