Neonatal hypoglycemia occurs when the neonates blood glucose level is less than the newborns body requirements for factors such as cellular energy and metabolism. There is inconsistency internationally for diagnostic thresholds. In the US, hypoglycemia is when the blood glucose level is below 30 mg/dL within the first 24 hours of life and below 45 mg/dL thereafter. In the UK, however, lower and more variable thresholds are used (<18 mg/dL at any time OR baby with abnormal clinical signs and a single value <45 mg/dL OR baby at risk of impaired metabolic adaptation but without abnormal clinical signs and a measurement <36 mg/dL and remaining <36 mg/dL at next measurement). The neonates gestational age, birth weight, metabolic needs, and wellness state of the newborn has a substantial impact on the neonates blood glucose level. There are known risk factors that can be both maternal and neonatal. This is a treatable condition. Its treatment depends on the cause of the hypoglycemia. Though it is treatable, it can be fatal if gone undetected. Hypoglycemia is the most common metabolic problem in newborns.Neonatal hypoglycemia occurs in between 1 in 3 births out of every 1,000 births but is hard to quantify internationally due to lack of consensus about diagnostic thresholds. It often occurs in premature babies, small full-term babies, babies of diabetic mothers, and is more common in neonatal hypoxic asphyxia, sclerosis, and infected sepsis. Severe hypoglycaemia with persistent or repeated episodes can cause damage to the central nervous system.
Long term complications of neonatal hypoglycemia may include:

Neurologic damage that results in mental retardation
Developmental delay
Personality disorders
Recurrent seizure activity
Impaired cardiovascular function

Research
Continuous glucose monitoring devices have been suggested to be helpful for improving blood glucose monitoring in neonatal infants, however, the devices have not been approved for use in this age group and the potential benefits and risks are not clear from available studies.The taḥnīk also exercises the muscles of the mouth and helps with the circulation of blood in the mouth - this may help the baby to be able to suck and take mothers milk. It is also credited to prevent neonatal hypoglycemia in newborn babies. See also
Congenital hyperinsulinism
Hyperinsulinemic hypoglycemia

References
Bibliography
Walker, Marsha (2011). Breastfeeding management for the clinician : using the evidence. Sudbury, Mass: Jones and Bartlett Publishers. ISBN 9780763766511.