.A plasma glucose level of less than 30 mg/dL (1.65 mmol/L) in the first 24 hours of life and less than 45mg/dL (2.5 mmol/L) thereafter constitutes hypoglycemia in the newborn. Dextrose also has medical purposes, Because dextrose is a "simple" sugar, the body can quickly use it for energy. Simple sugars can raise blood sugar levels very quickly, and they often lack nutritional value. Reference: GHAI Essential pediatrics, 8th edition