Hi! I just wanted to add about the iron / constipation issue: adding iron supplements or more iron-rich foods can be constipating in itself. I would add mango to your mix of fruits, and like another poster mentioned, pears. You can sometimes find applesauce mixed with mango in the pouches or in the jars, or of course you can make at home. I found those two fruits (pears and mangos) worked wonders for our babe when she was starting solids and becoming constipated.
My son became constipated at about 18 months and none of these tricks worked. We went through giving him benefiber, then later miralax to resolve it. Then one day around his 4th birthday, he just started going regularly on his own!
Also, like mammal said, testing iron levels is a pretty routine thing for 6-9 month olds (different docs do it at different times). I'd say there's nothing wrong with just asking them to run the test. They can check for lead levels at the same time it it's something you're concerned about and then babe only needs one stick!
Good luck! The iron / constipation balance is really tough (on top of the stress of the Dom decision!).