Sudden unexpected death in infancy (SUDI) is the term used for the sudden or unexpected death of a baby or infant in which the cause is not fully known.  

There are two main categories of SUDI which occur in babies under 12 months of age, including:  

1. Sudden infant death syndrome (SIDS)- no known cause of death whilst sleeping
2. Fatal sleeping accident- death is attributed to the child suffocating, being strangled or trapped whilst sleeping 

See the following for more information: 

• Sudden Unexpected Death in Infancy (SUDI) factsheet 

• Newborn Sleep page  

• SCHN news article.