When you have GD they will check your baby's blood sugar six times. Can't remember the exact but it's like I hr, 2hr, 3, 8, 12 and 24. I kinda made those up but it's frequent in the beginning and taper off. I hated it.
I tried pumping colostrum before giving birth but it didn't work for me. I think with this baby I'll just ask for formula if she needs something. Also the hospital that i birthed in woukd not have allowed a bottle brought in from home. Both my kiddos were fine; younger had borderline low sugar but evened out.
Exercise, like pp said, is really important. My fastings were creeping up until I started adding more vigorous walks/gym time.