Inadequate oral intake
Excess insulin
Newborns of diabetic mothers
Deficient hyperglycemic hormones (growth or adrenal hormone deficiency)
Inborn errors of metabolism: fatty acid oxidation or carbohydrate metabolism disorders
Prematurity (inadequate glycogen stores)
Sepsis
ETOH exposure (children have low glycogen stores)
Newborns of diabetic mothers
Non-neonatal hypoglycemia 
Critical Illness
Neonatal hypoglycemia
Sepsis
Neonatal abstinence syndrome
Organ Failure
Neonatal jaundice
Hepatic failure