Hi M.,
Vit C helps in absorbing iron and also if iron and calcium are taken together, it kind of interferes with eack other. So May be after gving some Iron rich food, you could follow it with a some gerber juice, whcih has 100% of daily need of Vit C.
Also lentils without cover are a very very good source of iron. There is one washed lentil which is available in Indian/pakistani/mediterannean grocery stores. It has got "Moong Daal" written on the packet. You could make soup out of it and give to your baby. It is very easily digestible. Or you could boil it, drain it and just give its water. babies in India start with this Daal water as early as 4 months to avoid anemia.
And if you are nursing, Please continue doing so, as the little iron which is present in this form is very easily digested and absorbed.
Red Kidney Beans paste or Hummus dip from walmart would also help apart from spinach, liver etc.One Gerber ArrowRoot Cookies has 10% of daily iron need.
I am sure your baby's iron level would be normal petty soon.