Muffins are great for breakfast and can be thawed/heated in the micro. (Plus can be eaten with one hand if the other is holding a fussy baby!) Choose whatever flavor they like best.
Waffles are also great, and can be thawed/reheated in the toaster (like the commercially available ones. They can be messy for little kids to eat (sticky syrup) Consider cutting in strips to dip in jam or syrup, and eat as finger food.
I always like to keep a meal's worth of pasta sauce in the freezer - I make mine from scratch rather than buy the jarred kind. It's easy to reheat while the pasta is cooking. Our family fav is
Will's Spaghetti. It makes enough to sauce 1 lb. of spaghetti, or 4-5 servings. So I would freeze in two portions, so they'd have two meals from it. Of course, if you have a family favorite sauce, it will undoubtedly freeze well too.
Mushroom Swiss Steak is easily packaged for two servings, and is comforting served over mashed potatoes, which can also be made ahead and frozen.
Baked Ziti can easily be portioned for two (as opposed to lasagna, where it can be tough to find small enough pans). No recipe to suggest, but perhaps you have a fav.
And, at least in the northern hemisphere, we're heading into cooler seasons. Soup, packaged in individual servings, can be a dinner, or a nice hot lunch. Most soups freeze well (you may want to cook/add pasta or rice at serving tine to keep in from bloating and being mushy - don't ask how I learned this!)
HTH,
Diane