I was going to wait at least a year.
I was fed something from a bowl at about 2 months, according to the pictures. I have suffered from environmental allergies, low-level food allergies (that change symptomatically from time to time), and have problems with my weight.
My husband was fed food, including meat, at 3 weeks. Yes, weeks. There was a misunderstanding between the ped and my MIL, but as soon as MIL talked to her mom at home in Korea, her mom told her that Americans were crazy, and to stop feeding him the foods. He does have sensitivities to some foods, which he always put down to his Asian side. He has also been very overweight most of his life.
With our early food intro and the problems we have had, we decided that breastfeeding exclusively at least a year would be a good idea. We developed signs to watch for. Grabbing at food wasn't enough; what's the point of giving a baby a *different* food than what they are grabbing for? For example, a big white glob of mayonnaise always seemed to attract him, but there was no way I was giving him that! So he had to express interest in a food I would actually give him. That turned out to be the most important, so it's the only guideline I'm remembering right now.
Just after 11 months, he nearly tackled me (I'm short and he's almost half my height already, and strong, so this was an almost scary experience!) for an organic apple. It was something I'd give him, it was organic, so he won.
He's now 12 months and a couple weeks, and has tried some fruits and a veggie or two, but just tastes them, mainly.
As for the iron, I have heard that an *exclusively* breastfed baby won't have problems with iron, because their gut can still extract it easily. But once solids are introduced, things change irreversibly, and a problem could arise. Hmm, perhaps I should give some thought to that...I'm still a bit in denial that he has anything but breastmilk.