R. -- I was diagnosed with anemia as a toddler. I'm now 44 years old and still anemic. Life - long for me. I think you should just rule out everything to know that it is only anemia.
If it is just anemia -- I took iron supplements as a child and continue to take them every day. As a child I would get my blood checked about once a year for the level -- now it's really about every three years now that I am an adult.
What you want to find out if it is anemia as a child is if it's a certain type of anemia called milk anemia - that's what I have -- where milk attacks the blood cells. As a toddler that's what the doctor told my Mom I had. Milk anemia. They had to get me off milk immediatley -- cow's milk that is. I take calcium supplements and can use soy milk instead.
They thought I would grow out of it. And when I was a teen they said I could have cow's milk again. It still didn't work. I started to drink milk like I was a milk alcoholic. It's tough cuz as a child you want them to drink milk for healthy growth. I was so low for my age as a teen that they gave me iron shots right in the dr. office one time. So they took me off milk again at 13. And made me eat liver once a week as an evening meal. Tough at 13 but I grew to like it.
It's just a fine line. Get a good doctor who can really help you determine what kind of anemia it is - if that is what it is. Get a second opinion if you aren't feeling like the doctor is really helping. My parents just kept taking me to specialist after specialist because no one was diagnosing me properly. So stay vigilant.
My baby pictures I look so sickly from about one year to two years as my parents struggled to find out what was wrong with me. I'm grateful they kept searching. I was severly anemic. Not mildly. That's over 40 years ago -- so times have changed, and I think they can find out tons now just from a full blood profile. Get that done. The full blood profile (I think it's called an H and H -- for something like hemoglobin and hemostat -- something like that) anyway....it's done by the arm -- not by finger.
I will always be anemic in some way. So iron pills are a constant for me as a woman who still menustrates. At least boys don't do that. Losing that blood iron on top of the anemia was hard for me as a young teen girl. Your son won't have that to contend with.
The good news is it can be controled -- thru vitamin supplements and monitoring the blood count with the dr. I don't drink glasses of cow's milk to this day. I take supplements for bone health. That's the only way it impedes on my daily life -- once it's diagnosed properly to see if it is anemia. I can't ever give blood either because of my anemia. And as a choice, I no longer eat liver. Good luck.