Dödsorsak Translation please...

[John Anderson]

For Cause of Death (Dödsorsak) for one of my ancestors, the cause is listed as Okänd Barnsjukdom.  Could someone please tell me what this means in English?
 
Thank you ever so much for your help in advance,
 
John Anderson

[Kristina Berglund]

Hi! The cause of death is just unknown child desease.

[John Anderson]

Thank you so much for the quick translation!
 
John Anderson