Most common features:
Vomiting
Altered mental status
Poor feeding
May also see lethargy, apnea, seizure
Vomiting
Altered mental status
Poor feeding
May also see lethargy, apnea, seizure
Non-neonatal hypoglycemia 
Critical Illness
Neonatal hypoglycemia
Sepsis
Neonatal abstinence syndrome
Organ Failure
Neonatal jaundice
Hepatic failure