Gestation Diabetes Mellitus (GDM) is a condition of high blood sugar levels in the mother during pregnancy. A new study conducted in Finland an published in the journal Acta Diabetologica has found that high blood sugar levels during pregnancy lead to a lack of oxygen in the foetus..The study monitored the foetal heart rate and uterine contractions using a cardiotocography (CTG) test. The observations showed that in women with GDM, the heart rate of the foetus had a zigzag pattern, was more than 25 beats per minute lasting for a minute and had delayed changes in the heart function. These were triggered by uterine contraction of the mother causing lowered oxygen supply to the baby. Consult your diabetologist and gynaecologist to better manage your health parameters.