I've noticed that stage 1 foods are all just one fruit or veggie, but stage 2 are usually mixed fruits and veggies. My question is why mix them? I plan on making my own baby food, if my DD will eat the fruits and veggies plan is there a reason to mix them together other than for flavor?
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Re: Why mix food?
Ditto this
And as long as it tastes nice together, then I'd say it's more "real world". Like a little recipe or something 
I like doing it from a nutrient stand point as well as the taste reasons and disguising the ones he is less fond of. I also do it because I think it is easier to just have 1 dish rather than a dish of meat, a dish of veggies and a dish of fruit for each meal.
I think they don't mix the stage 1s because you have to do the 4 day wait rule and if it was mixed that would make that impossible. By stage 2 you aren't introducing as many things.