Baby has iron deficiency anemia and has fever for 3 days now. lab results show normal platelet count, low hemoglobin, high wbc. is this an emergency?

Not necessarily: You don't mention how old the baby is, but iron deficiency is rare before 6 months except in babies born prematurely. You don't mention how low the hemoglobin is, but unless it's very low the fever should not be a problem. If you're concerned, the doctor caring for the baby's anemia would have the best idea how concerned to be about the fever and the anemia.

Doesn't sound like : It, if your child truly is 1yo. A few days of fever, due to a viral illness for example, is not uncommon. I'd give you a different answer for a 2-3mo child. If your child is staying well hydrated despite the insensible losses, he will probably be fine. If you're uncertain, go see your pediatrician. The blood counts by themselves are not that concerning, provided anemia is being treated.