This is the line I was looking for. Beta minor won't usually be diagnosed at birth, but alpha carriers will be, so this should eliminate alpha thal as a possibility.
Hemoglobinopathy (HGB) - FA - no abnormal bands detected
Concerning your own results, I had assumed 2011 when you wrote last year in July. Now it all makes sense and actually more than some of your test results, the drop in your Hb level during pregnancy is totally consistent with thal minor. Your MCV and MCH are borderline, but a drop to below 9 is fairly common in thal minors during pregnancy. Mother and child definitely appear to be beta thal minors (carriers). The phenotype, or physical manifestation of thal minor can vary depending on the type of mutation or deletion of the beta globin gene, and this is also affected by other factors, but thal minor in general is not a serious condition. However, perhaps its worst effect, based on the amount of reports we have heard here, may be its effects during pregnancy. You have already experienced the drop in hemoglobin, and we hear regularly from thal minor women who have had multiple miscarriages, so thal may also be a contributing factor in your case too. I normally recommend natural vitamin E as a way to help prevent miscarriages in thal minors, along with high dose folic acid, but if you are under therapy to thin blood, you should always consult with your doctor before taking vitamin E or aspirin, because they both have blood thinning properties. I would suggest daily folic acid for you and your son, and if you do get pregnant again, move to a dose of at least 2 mg daily.
I have heard that thal majors should avoid sulfa drugs. I would suggest that you make sure sulfa is not used again, as it did set off an attack of hemolysis. His medical record should include this information, so that he is not given sulfa again. Should he have another attack, review all foods and medications he has had, including Nsaids, like ibuprofen. It is likely that only sulfa is the problem because it is beta thal, so hopefully it won't occur anymore. Your own normal Hb level seems low end of normal, which isn't bad for thal minor, so your son may follow the same course. You alluded earlier to the severity of thalassemia depending on regions, and there are genotypes that are more common in some ethnic groups than others, so a beta+ genotype may be more common in certain areas than beta ° is, resulting in milder forms of thalassemia. Since your normal Hb is over 11, there is a good chance that you are a beta+. This can be confirmed by DNA testing, but would not be considered essential by many insurance companies.