Der kan forekomme symptomer såsom åndedrætsforstyrrelse, cyanose, apnø, anfald, ustabil temperatur, besvær ved amning, opkastning, hypoglykæmi, hypertoni, hypotoni, hyperrefleks, tremor, rysten, irritabilitet, letargi, konstant gråd, somnolens og søvnbesvær.
Symptoms such as respiratory distress, cyanosis, apnoea, seizures, temperature instability, feeding difficulty, vomiting, hypoglycaemia, hypertonia, hypotonia, hyperreflexia, tremor, jitteriness, irritability, lethargy, constant crying, somnolence and difficulty in sleeping may occur.