Easiest protein baby food ever

Silken tofu. Yep. Don't get the firm kind, it doesn't blend up well. But silken tofu works right out of the package (just stir it a little to break it up), and is really high in protein. And Thomas loves it. I wouldn't freeze it though.

Almost as easy: egg yolk. They can't have the whites until they're one year old, but yolks are ok. You hard-boil an egg, peel it and remove the yolk. Then mash with a fork with a little breast milk or formula (water doesn't really work here: my chemistry intuition, such as it is, is telling me it needs the fats and stuff of the milk to really dissolve) and serve. One is 55 calories (right now that's >10% of the calories Thomas needs from solids every day) and has lots of protein.

Thomas started eating both of these at about 7.5-8 months. He probably could have had the tofu earlier, but they don't sell silken tofu at our local grocery store, so that was harder.

Even before that, at almost 7 months, I gave him lentils. Lentils don't need to be presoaked; I just covered dried lentils with water, covered the pot, boiled them for 30 minutes, checked to be sure they were very soft. Then I put them with the water in the blender and blended it up. He likes them mixed with rice cereal or barley cereal. Baby food doesn't get much cheaper than lentils and rice cereal.