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Neonatal

A rare form of diabetes diagnosed in the first six months of life, distinct from type 1 and type 2 diabetes. It is caused by genetic mutations that affect insulin production, leading to high blood glucose levels.  

There are two main types:  

  • Transient Neonatal Diabetes Mellitus (TNDM) - this is the more common type, accounting for 50-60% of NDM cases. It is characterised by diabetes that appears in the first few months of life but resolves on its own, usually before the baby's first birthday. 
  • Permanent Neonatal Diabetes Mellitus (PNDM) - Permanent neonatal diabetes as expected, lasts forever and accounts for 40–50% of all cases. 

Please note, some people may experience a recurrence of the condition later in life, often during adolescence. 

Key characteristics include: 

  • Onset in the first six months of life - unlike type 1 diabetes, which typically appears later, NDM manifests within the first six months of life.
  • Hyperglycaemia - elevated blood glucose levels are a hallmark of NDM. 
  • Insulin deficiency - the pancreas either does not produce enough insulin or produces none.  

Back to 'Diabetes – Children & Young People (CYP)'

Page last updated 19 November 2025

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