My baby weights 2900 grams at 36 weeks of pregnancy. i have gd but controlled by diet.i'm small,158cm, and wonder if vaginal birth is for me or not?

Probably: Vaginal birth is dependent on many factors in the mother, the baby and the passages ( your pelvis and the power of contractions), generally speaking you would be a candidate for vaginal birth, but your obstetrician would better assess that and during labor many factors contribute, wish you an uneventful pregnancy and labor and a healthy baby

I WOULD TRY: Your recovery would be shorter with a vaginal birth so planning to would be a good idea. Your obstetrician likely has an idea if your pelvic shape is likely to allow a regular delivery, which you could find out from them.Sometimes during labor things will come up showing stress with baby or your blood pressure could go crazy & in either case delivering c-section would be the common solution