What are the key clinical signs of neonatal sepsis that I should be vigilant for in a newborn?

Guideline-aligned answer with reasoning, red flags and references. Clinically reviewed by Dr Kola Tytler MBBS CertHE MBA MRCGP.

Posted: 22 August 2025Updated: 22 August 2025 Guideline-Aligned (High Confidence) Clinically Reviewed
Dr Kola Tytler MBBS CertHE MBA MRCGPClinical Lead • iatroX

Key clinical signs of neonatal sepsis that healthcare professionals should be vigilant for include:

  • Red flag signs: apnoea (temporary stopping of breathing), seizures, need for cardiopulmonary resuscitation, need for mechanical ventilation, and signs of shock .
  • Altered behaviour or responsiveness, such as appearing ill, not waking or not staying awake when roused, weak high-pitched or continuous cry ,.
  • Altered muscle tone, for example, floppiness .
  • Feeding difficulties including feed refusal, feed intolerance, vomiting, excessive gastric aspirates, and abdominal distension .
  • Abnormal heart rate: bradycardia or tachycardia .
  • Signs of respiratory distress such as grunting, chest recession, tachypnoea, nasal flaring, and hypoxia (central cyanosis or reduced oxygen saturation) ,,.
  • Temperature abnormalities: hypothermia (below 36°C) or fever (above 38°C) unexplained by environmental factors ,.
  • Jaundice within 24 hours of birth .
  • Signs of neonatal encephalopathy and bulging fontanelle ,.
  • Unexplained excessive bleeding, thrombocytopenia, or abnormal coagulation .
  • Altered glucose homeostasis (hypoglycaemia or hyperglycaemia) and metabolic acidosis .
  • Skin changes such as mottled or ashen appearance, cyanosis of skin, lips or tongue, and non-blanching rash ,.
  • Other signs include persistent pulmonary hypertension of the newborn and seizures ,.

Healthcare professionals should consider these signs collectively, especially the presence of any red flags or multiple clinical indicators, to promptly identify and manage neonatal sepsis ,.

Educational content only. Always verify information and use clinical judgement.