My mother had gestation diabetes during her last 3 pregnancies. Both my brother and sister were delivered a month early weighing 10lb 3oz and 11lb 1oz, but were both healthy. My sister did need to stay a few days longer after my mom was discharged because her blood sugar was a bit low
Just eat as healthy as you can :)
I personally haven't but my friend just gave birth to a beautiful healthy 9 pound baby girl no problems at all. She was diagnosed with gestational diabetes only thing they did for babies health was delivered r her 2 weeks early because aparently don't quote me diabetes babies are bigger and they consume alot more sugar inside so it's best to get them out abit earlier but no issues were had with either mum or baby :)
My sister in law developed diabetes during pregnancy but it resolved right when my nephew was born and he was completely healthy with no signs of diabetes. He's a thriving 6 month old now. Good luck!