The dangers of gestational diabetes include an increased risk of miscarriage, preterm birth, and stillbirth, as well as a higher incidence of polyhydramnios and macrosomia. There is also a risk of difficult labor and birth injuries during delivery, and an increased risk of postpartum hemorrhage due to uterine atony. Additionally, gestational diabetes may lead to an increased fetal mortality rate, which is associated with elevated blood glucose levels in pregnant women.