Modestly elevated BG also a risk

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The original HAPO study found that even modestly elevated blood glucose levels increased the risks of complications for the baby both before and shortly after birth. Based on these results many, but not all, organizations adopted a new definition of gestational diabetes, a type of diabetes that occurs during pregnancy.

I couldn't come across the actual BG numbers for the "new definition" but here's the study,

https://www.nih.gov/news-events/news-releases/high-blood-sugar-during-pregnancy-ups-risk-mothers-type-2-diabetes-childs-obesity