My daughter was one of those babies who didn't really show interest in solids until around 18 months. I feel so grateful that our pediatrician was ultra supportive. Maybe it helped that DD was always on the upper range of the growth curve (though the ped actually never made a big deal out of this). I remember showing concern during our well baby appointments at around 9 months or a year, and again at around 15 months. The ped just encouraged me to be patient, keep offering, and to make a point of including baby in our family meals (and offering baby the same foods that we were eating, within reason), as opposed to concocting special meals just for the baby. It is common practice in the state we were living in at the time to run a blood test for anemia (as well as lead poisoning) at 12 months. For what it's worth, my DD showed no anemia deficiency as a result of this test, despite being EBF and eating nearly no solids at 12 months.
In retrospect, a few things happened at around 18 months that made her more interested in food. First and foremost, she weaned. After weaning at 18 months, I was giving her goat/cow's milk for a while (at bedtime), but I found that once I was able to get her off milk completely at around 24 months her interest in food increased dramatically! (She also became a fantastic sleeper for the first time ever.) Second, her teeth were somewhat late to come in (her first tooth emerged at 9 months). I noticed that she was much more interested in food once she had more teeth - especially molars that could chew up things like raisins, cashews, and apple slices dipped in peanut butter.
But do let me be clear -- I don't by any means recommend that you end your nursing relationship just to try to get your baby to eat! I only noticed this (possible) correlation after the fact with my daughter and I found it interesting.
Oh, and you asked about foods with iron -- many foods actually contain high amounts of iron, so fortification is not the only way in the world to get it! Many meats - especially liver (and maybe lamb?) - are very high in iron. But so is spinach and other dark leafy greens. Some beans, and especially lentils, also have a fair amount. Dried fruits like apricots are also a decent source. Cooking in cast iron also helps.