Does Iron Deficiency Cause Paleness In A Child

My 5 year old son is very pale compared to other children and he doesn t want to sit down and eat a meal.... It s a fight everyday! He doesn t wanna run and play outside he would rather lay on the couch. Tonight I walked into his room and he looked pale and blue and it actually have me a scare! His father had an iron deficiency as a child..... Could it be that? How serious is it? How can I treat it?