A three month-old boy who was critically injured in the crash that claimed the life of his mother at Upper Caboolture has died.
The 33 year-old Caboolture woman died when her four wheel drive crashed into a tree on Caboolture River Road last Friday.
Her son died in hospital yesterday afternoon with police revealing he was thrown from an approved baby seat in the crash.
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Investigations into the crash are continuing and anyone with information is urged to contact police.