With gestational diabetes
you have to consider your risks of dystocia, maturity of your infant, & how favorable your cervix
Usually if the efw is > 4 kilos (approx 9 lbs), recommendations are for c-section, to avoid the complications of dystocia. Discuss this with your OB since your prior history, glycemic control, & ease of prior deliveries all factor in what's best for you. Congrats on baby.