Two miscarriages in 4 months.in april i had a missed miscarriage.in august i had a miscarriage at 5 weeks. what could cause this?im almost 20 and 80lb

Repeated miscariage: Needs proper work up . There is a medical condition called anitphophlipid syndrome which is one of the culprit . Your doc may screen you for it among other things.

Many reasons: There are many reasons for a miscarriage. The most common reason is a genetic problem with the embryo (baby). You had 2 miscarriages, the concern is whether you have a condition called recurrent pregnancy loss (rpl). In 1/2 the time we do not find a reason for rpl, but in the other 1/2 we find either a genetic problem with one of the partners, a cloting condition with or uterine problem in woman.

Low BMI.: Poor maternal nutritional status as evidenced by your 80 lb weight is a known predisposing factor to miscarriage. At your age, i would advise maintaining your body mass index (bmi) at the 19-27 range if you are trying to conceive. Take Folic Acid >1 mg daily and best of luck!